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Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , John Johansen , Paul Moore , James Morris , "Serge E. Hallyn" , Stephen Smalley , Eric Paris , Mykola Lysenko , Shuah Khan Cc: Geliang Tang , bpf@vger.kernel.org, netdev@vger.kernel.org, mptcp@lists.linux.dev, apparmor@lists.ubuntu.com, linux-security-module@vger.kernel.org, selinux@vger.kernel.org, linux-kselftest@vger.kernel.org Subject: [PATCH bpf-next v8 1/4] bpf: Add update_socket_protocol hook Date: Thu, 3 Aug 2023 15:30:39 +0800 Message-Id: <120b307aacd1791fac016d33e112069ffb7db21a.1691047403.git.geliang.tang@suse.com> X-Mailer: git-send-email 2.35.3 In-Reply-To: References: X-ClientProxiedBy: TYAPR01CA0090.jpnprd01.prod.outlook.com (2603:1096:404:2c::30) To HE1PR0402MB3497.eurprd04.prod.outlook.com (2603:10a6:7:83::14) Precedence: bulk X-Mailing-List: bpf@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: HE1PR0402MB3497:EE_|AM9PR04MB8571:EE_ X-MS-Office365-Filtering-Correlation-Id: 602f81aa-90a5-4ff5-e34d-08db93f38f2e X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; 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One user case is to force legacy TCP apps to create and use MPTCP sockets instead of TCP ones. Define a mod_ret set named bpf_mptcp_fmodret_ids, add the hook update_socket_protocol into this set, and register it in bpf_mptcp_kfunc_init(). Signed-off-by: Geliang Tang Acked-by: Matthieu Baerts --- net/mptcp/bpf.c | 17 +++++++++++++++++ net/socket.c | 25 +++++++++++++++++++++++++ 2 files changed, 42 insertions(+) diff --git a/net/mptcp/bpf.c b/net/mptcp/bpf.c index 5a0a84ad94af..c43aee31014d 100644 --- a/net/mptcp/bpf.c +++ b/net/mptcp/bpf.c @@ -12,6 +12,23 @@ #include #include "protocol.h" +#ifdef CONFIG_BPF_JIT +BTF_SET8_START(bpf_mptcp_fmodret_ids) +BTF_ID_FLAGS(func, update_socket_protocol) +BTF_SET8_END(bpf_mptcp_fmodret_ids) + +static const struct btf_kfunc_id_set bpf_mptcp_fmodret_set = { + .owner = THIS_MODULE, + .set = &bpf_mptcp_fmodret_ids, +}; + +static int __init bpf_mptcp_kfunc_init(void) +{ + return register_btf_fmodret_id_set(&bpf_mptcp_fmodret_set); +} +late_initcall(bpf_mptcp_kfunc_init); +#endif /* CONFIG_BPF_JIT */ + struct mptcp_sock *bpf_mptcp_sock_from_subflow(struct sock *sk) { if (sk && sk_fullsock(sk) && sk->sk_protocol == IPPROTO_TCP && sk_is_mptcp(sk)) diff --git a/net/socket.c b/net/socket.c index 2b0e54b2405c..586a437d7a5e 100644 --- a/net/socket.c +++ b/net/socket.c @@ -1644,11 +1644,36 @@ struct file *__sys_socket_file(int family, int type, int protocol) return sock_alloc_file(sock, flags, NULL); } +/** + * A hook for bpf progs to attach to and update socket protocol. + * + * A static noinline declaration here could cause the compiler to + * optimize away the function. A global noinline declaration will + * keep the definition, but may optimize away the callsite. + * Therefore, __weak is needed to ensure that the call is still + * emitted, by telling the compiler that we don't know what the + * function might eventually be. + * + * __diag_* below are needed to dismiss the missing prototype warning. + */ + +__diag_push(); +__diag_ignore_all("-Wmissing-prototypes", + "kfuncs which will be used in BPF programs"); + +__weak noinline int update_socket_protocol(int family, int type, int protocol) +{ + return protocol; +} + +__diag_pop(); + int __sys_socket(int family, int type, int protocol) { struct socket *sock; int flags; + protocol = update_socket_protocol(family, type, protocol); sock = __sys_socket_create(family, type, protocol); if (IS_ERR(sock)) return PTR_ERR(sock); From patchwork Thu Aug 3 07:30:40 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Geliang Tang X-Patchwork-Id: 13339389 X-Patchwork-Delegate: bpf@iogearbox.net Received: from lindbergh.monkeyblade.net (lindbergh.monkeyblade.net [23.128.96.19]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 663E812B6A; Thu, 3 Aug 2023 07:31:54 +0000 (UTC) Received: from EUR01-HE1-obe.outbound.protection.outlook.com (mail-he1eur01on2057.outbound.protection.outlook.com [40.107.13.57]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 1AA0D4684; Thu, 3 Aug 2023 00:31:39 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; s=arcselector9901; d=microsoft.com; cv=none; b=l5cRq5D+CAPbQtUn1JTTiKTOqmdc3duOxZdEmkGRMkYuFHITT20jXx+I0IpHz37I8f4D9GZ0QAqyzB0WdglHQa2s7iKOJ1QdXlvrQuYX107niUG+e68Y2M+T1eaLKefUBkw2Il9rGIhtdKgaSvQXsGoA+g1StNMBXmj6mA1hX8NVNr10R1RJOTcnDR77FxKtqHqwuQKJFJE5NtqqNY8zpPMmz6fYgmXaDDYNLuycnw4hAAbaAVbxZyQqTc3csNBX9fP8pHcnP2fNm6vywZGakXfzQhHTGuYTc3j/iUSAjB3TjTWWExFsHsj7YH6CL9CBJn7IsMDk+neZAb6mY+TWDg== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=microsoft.com; s=arcselector9901; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-AntiSpam-MessageData-ChunkCount:X-MS-Exchange-AntiSpam-MessageData-0:X-MS-Exchange-AntiSpam-MessageData-1; bh=02iyHHjkQUGelZcQ1iDaZ+J0TmCKyxhCWbnucp6bY4w=; b=oZLlyHZeQwhV4dSA1vvPz0P3Ny0lqbqI4S32w/Fw8f17wYFdHWPoLt9ITgYq67Y39zTQVXXFnsfH2Y5zKqntWKGzyo4O/m72fiMPjb5Zpx15N6esFvBkt687qNOT0USQnQTHny7N9u6zb3qIJZfpF0+xFKjLlp0DMicmVKbweh6t2BgvzwZcUYjpPGEnh6/3rg1IwNlVRI1iO7dGOq3vduHdK7pOSmFnvGhmPO7C1xLa1Eg30QYc5rHr3GPaH7V5HPa5Ck4e798S23pYiR1AhRjaGivZh36xdlbVVngYveH4JCMQBWfwXbFGzHkxqtbrHBPvPbHVliotf2dLQ2eYrQ== ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=pass smtp.mailfrom=suse.com; dmarc=pass action=none header.from=suse.com; dkim=pass header.d=suse.com; arc=none DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.com; s=selector1; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=02iyHHjkQUGelZcQ1iDaZ+J0TmCKyxhCWbnucp6bY4w=; b=YkfwD3gUFybQbEbtdCXHqomaeIvVkbI6aCMFirkTF6/TNhe27caGV+1pXzCXzU0zQjIF+UQwDiKxRHPAR2cpWqYFPmm52korAIuPw1aAW3kw7T2GoePJrju6sveYjbH76y4f3btd8kWsXlT6UUrtCt3T/7EUPG0sUWJ2i4UCotZaOI4AGTp8mN95YbKclQR/MVvmE9cPo6ACY+bp46mxo9ZmLpBTWZ9xIXb46LJ7PC48ekkqJyLqfaotA4RxDmk/Iv2z6aFf55dKjYJEZqOmeiQiethjFekuvmXl5EWB8xMoeX5flm1LFaEX0NQZ9twHutf6VgNdjH2CS69OKqMXSA== Authentication-Results: dkim=none (message not signed) header.d=none;dmarc=none action=none header.from=suse.com; Received: from HE1PR0402MB3497.eurprd04.prod.outlook.com (2603:10a6:7:83::14) by AM9PR04MB8571.eurprd04.prod.outlook.com (2603:10a6:20b:436::23) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.6652.20; Thu, 3 Aug 2023 07:31:00 +0000 Received: from HE1PR0402MB3497.eurprd04.prod.outlook.com ([fe80::bf65:a49a:8861:4f92]) by HE1PR0402MB3497.eurprd04.prod.outlook.com ([fe80::bf65:a49a:8861:4f92%2]) with mapi id 15.20.6631.045; Thu, 3 Aug 2023 07:31:00 +0000 From: Geliang Tang To: Alexei Starovoitov , Daniel Borkmann , Andrii Nakryiko , Martin KaFai Lau , Song Liu , Yonghong Song , John Fastabend , KP Singh , Stanislav Fomichev , Hao Luo , Jiri Olsa , Florent Revest , Brendan Jackman , Matthieu Baerts , Mat Martineau , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , John Johansen , Paul Moore , James Morris , "Serge E. Hallyn" , Stephen Smalley , Eric Paris , Mykola Lysenko , Shuah Khan Cc: Geliang Tang , bpf@vger.kernel.org, netdev@vger.kernel.org, mptcp@lists.linux.dev, apparmor@lists.ubuntu.com, linux-security-module@vger.kernel.org, selinux@vger.kernel.org, linux-kselftest@vger.kernel.org Subject: [PATCH bpf-next v8 2/4] selftests/bpf: Use random netns name for mptcp Date: Thu, 3 Aug 2023 15:30:40 +0800 Message-Id: X-Mailer: git-send-email 2.35.3 In-Reply-To: References: X-ClientProxiedBy: TY2PR02CA0070.apcprd02.prod.outlook.com (2603:1096:404:e2::34) To HE1PR0402MB3497.eurprd04.prod.outlook.com (2603:10a6:7:83::14) Precedence: bulk X-Mailing-List: bpf@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: HE1PR0402MB3497:EE_|AM9PR04MB8571:EE_ X-MS-Office365-Filtering-Correlation-Id: c66755ac-99c2-455b-11a7-08db93f395b6 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:255.255.255.255;CTRY:;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:HE1PR0402MB3497.eurprd04.prod.outlook.com;PTR:;CAT:NONE;SFS:(13230028)(376002)(346002)(366004)(39860400002)(396003)(136003)(451199021)(6666004)(110136005)(6486002)(41300700001)(478600001)(7416002)(5660300002)(8936002)(8676002)(7406005)(186003)(4326008)(6512007)(316002)(66476007)(26005)(6506007)(66556008)(66946007)(2616005)(2906002)(83380400001)(44832011)(36756003)(38100700002)(921005)(86362001)(13296009)(17423001);DIR:OUT;SFP:1101; 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By doing that, we can re-launch the test even if there was an issue removing the previous netns or if by accident, a netns with this generic name already existed on the system. Note that using a different name each will also help adding more subtests in future commits. Signed-off-by: Geliang Tang Reviewed-by: Matthieu Baerts --- tools/testing/selftests/bpf/prog_tests/mptcp.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/tools/testing/selftests/bpf/prog_tests/mptcp.c b/tools/testing/selftests/bpf/prog_tests/mptcp.c index cd0c42fff7c0..4ccca3d39a8f 100644 --- a/tools/testing/selftests/bpf/prog_tests/mptcp.c +++ b/tools/testing/selftests/bpf/prog_tests/mptcp.c @@ -7,7 +7,7 @@ #include "network_helpers.h" #include "mptcp_sock.skel.h" -#define NS_TEST "mptcp_ns" +char NS_TEST[32]; #ifndef TCP_CA_NAME_MAX #define TCP_CA_NAME_MAX 16 @@ -147,6 +147,8 @@ static void test_base(void) if (!ASSERT_GE(cgroup_fd, 0, "test__join_cgroup")) return; + srand(time(NULL)); + snprintf(NS_TEST, sizeof(NS_TEST), "mptcp_ns_%d", rand()); SYS(fail, "ip netns add %s", NS_TEST); SYS(fail, "ip -net %s link set dev lo up", NS_TEST); From patchwork Thu Aug 3 07:30:41 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Geliang Tang X-Patchwork-Id: 13339390 X-Patchwork-Delegate: bpf@iogearbox.net Received: from lindbergh.monkeyblade.net (lindbergh.monkeyblade.net [23.128.96.19]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 9369E101CC; Thu, 3 Aug 2023 07:31:57 +0000 (UTC) Received: from EUR01-HE1-obe.outbound.protection.outlook.com (mail-he1eur01on2047.outbound.protection.outlook.com [40.107.13.47]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 82AF446A4; Thu, 3 Aug 2023 00:31:51 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; s=arcselector9901; d=microsoft.com; cv=none; b=RnRMk1GYPmY7F0oTYnODCjuHXThHKnb1EoMurBOQLrnjKmTglaR/6koqAdOdX+STMqEECxX90922LSupgZl88ISzJ36ltZyUQ8kCx2LmClXuc4xo570IROOGKJhdu6+ZcbWRwyJTmslD/4npAgd8q+TpfgFRwvfIdltWERkQLaf1NTmFtGPWgj1upEMye3Ph/E7PaYuCNYUHkWAgr8NmlKbq6wcLWWmzEqNInKuIpV8iFTpJzN99FxsQ+o5x1IHMdWNZL7ZLS4NrqAxzGSWwWtZxw/9bn9teL7tmoXmXUAApNI+Qwetle2iINC3p127gLqfhhYrjJnXqZ3CBb9XhPQ== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=microsoft.com; s=arcselector9901; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-AntiSpam-MessageData-ChunkCount:X-MS-Exchange-AntiSpam-MessageData-0:X-MS-Exchange-AntiSpam-MessageData-1; bh=lWqMc9UT7yWdDRGAA1JFdqK94iY4Pu9Cr1Kw+TYOXMg=; b=ne9w+SASlk/Lv95MbMWhAhkQTdsdNtw+2FU2WFehqL/H2PkVTqdFZ+sJlHKQbYdDc218G7AD7Urtujlht0sKh89tjz4TC0jBdN2+aNHeO3GO1wdghplI+rPM/tNYvr9jFXvxXBXZ349lVpyf1pVtgQb0RFgy2t3m0PrAK6hDg+eCH0kBP4Hx1pgpBV+XcGJhh7XdV52oRmH/NjvcvkKz6G3J5bM46vxgISRmu+UG3mBRAoMjT8x17lSZkgzYn6zhq/+66QuhJgCrbvYYHYog/h+SfQ08zE5f4G0Elqe5tIHFNjXC5FhUdU9YpRXhFNQbOrXnHhfpOWPiKcz7cCusgw== ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=pass smtp.mailfrom=suse.com; dmarc=pass action=none header.from=suse.com; dkim=pass header.d=suse.com; arc=none DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.com; s=selector1; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=lWqMc9UT7yWdDRGAA1JFdqK94iY4Pu9Cr1Kw+TYOXMg=; b=JPj0Irxqq1r9Z4qcZJMIEjW97dKK1EB9SHMvK0HSm1oWGMXkTH9IeFBGvmUeH4b03r2WoWZSYAbBjXJbmHZJr0h3K2otKGjWJaejLrAon/5jT/7cZd9mRDL96HHkVkrJfzOjN7JZ+DrqfyJkVrPy7ZX1VruFvafFrPhCXti5ZmJ6spt8uRMjJ4lND+Oel9qhX9WqC6e6EDk5nJqMYKdQRMIDRUTC2RsHM7eUjx49pGLm4Ur2y6QUhdOScFX3bG2CrKgvrb1dZlzxjv9cElButnqetmHG67MXmCos3ZeNr0v+ZyqePui9chuDE/+jqG/dU4lYbWmaq6aJi9e/5eHJ4w== Authentication-Results: dkim=none (message not signed) header.d=none;dmarc=none action=none header.from=suse.com; Received: from HE1PR0402MB3497.eurprd04.prod.outlook.com (2603:10a6:7:83::14) by AM9PR04MB8571.eurprd04.prod.outlook.com (2603:10a6:20b:436::23) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.6652.20; Thu, 3 Aug 2023 07:31:10 +0000 Received: from HE1PR0402MB3497.eurprd04.prod.outlook.com ([fe80::bf65:a49a:8861:4f92]) by HE1PR0402MB3497.eurprd04.prod.outlook.com ([fe80::bf65:a49a:8861:4f92%2]) with mapi id 15.20.6631.045; Thu, 3 Aug 2023 07:31:10 +0000 From: Geliang Tang To: Alexei Starovoitov , Daniel Borkmann , Andrii Nakryiko , Martin KaFai Lau , Song Liu , Yonghong Song , John Fastabend , KP Singh , Stanislav Fomichev , Hao Luo , Jiri Olsa , Florent Revest , Brendan Jackman , Matthieu Baerts , Mat Martineau , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , John Johansen , Paul Moore , James Morris , "Serge E. Hallyn" , Stephen Smalley , Eric Paris , Mykola Lysenko , Shuah Khan Cc: Geliang Tang , bpf@vger.kernel.org, netdev@vger.kernel.org, mptcp@lists.linux.dev, apparmor@lists.ubuntu.com, linux-security-module@vger.kernel.org, selinux@vger.kernel.org, linux-kselftest@vger.kernel.org Subject: [PATCH bpf-next v8 3/4] selftests/bpf: Add two mptcp netns helpers Date: Thu, 3 Aug 2023 15:30:41 +0800 Message-Id: <72b924b35bdad2a598534e32869cf3a19516bace.1691047403.git.geliang.tang@suse.com> X-Mailer: git-send-email 2.35.3 In-Reply-To: References: X-ClientProxiedBy: TYAPR01CA0030.jpnprd01.prod.outlook.com (2603:1096:404:28::18) To HE1PR0402MB3497.eurprd04.prod.outlook.com (2603:10a6:7:83::14) Precedence: bulk X-Mailing-List: bpf@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: HE1PR0402MB3497:EE_|AM9PR04MB8571:EE_ X-MS-Office365-Filtering-Correlation-Id: 3ddaec91-cb1e-4855-9409-08db93f39bee X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; 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Use them in test_base(). These new helpers will be re-used in the following commits introducing new tests. Signed-off-by: Geliang Tang Reviewed-by: Matthieu Baerts --- .../testing/selftests/bpf/prog_tests/mptcp.c | 35 ++++++++++++------- 1 file changed, 23 insertions(+), 12 deletions(-) diff --git a/tools/testing/selftests/bpf/prog_tests/mptcp.c b/tools/testing/selftests/bpf/prog_tests/mptcp.c index 4ccca3d39a8f..4407bd5c9e9a 100644 --- a/tools/testing/selftests/bpf/prog_tests/mptcp.c +++ b/tools/testing/selftests/bpf/prog_tests/mptcp.c @@ -22,6 +22,26 @@ struct mptcp_storage { char ca_name[TCP_CA_NAME_MAX]; }; +static struct nstoken *create_netns(void) +{ + srand(time(NULL)); + snprintf(NS_TEST, sizeof(NS_TEST), "mptcp_ns_%d", rand()); + SYS(fail, "ip netns add %s", NS_TEST); + SYS(fail, "ip -net %s link set dev lo up", NS_TEST); + + return open_netns(NS_TEST); +fail: + return NULL; +} + +static void cleanup_netns(struct nstoken *nstoken) +{ + if (nstoken) + close_netns(nstoken); + + SYS_NOFAIL("ip netns del %s &> /dev/null", NS_TEST); +} + static int verify_tsk(int map_fd, int client_fd) { int err, cfd = client_fd; @@ -147,13 +167,8 @@ static void test_base(void) if (!ASSERT_GE(cgroup_fd, 0, "test__join_cgroup")) return; - srand(time(NULL)); - snprintf(NS_TEST, sizeof(NS_TEST), "mptcp_ns_%d", rand()); - SYS(fail, "ip netns add %s", NS_TEST); - SYS(fail, "ip -net %s link set dev lo up", NS_TEST); - - nstoken = open_netns(NS_TEST); - if (!ASSERT_OK_PTR(nstoken, "open_netns")) + nstoken = create_netns(); + if (!ASSERT_OK_PTR(nstoken, "create_netns")) goto fail; /* without MPTCP */ @@ -176,11 +191,7 @@ static void test_base(void) close(server_fd); fail: - if (nstoken) - close_netns(nstoken); - - SYS_NOFAIL("ip netns del " NS_TEST " &> /dev/null"); - + cleanup_netns(nstoken); close(cgroup_fd); } From patchwork Thu Aug 3 07:30:42 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Geliang Tang X-Patchwork-Id: 13339391 X-Patchwork-Delegate: bpf@iogearbox.net Received: from lindbergh.monkeyblade.net (lindbergh.monkeyblade.net [23.128.96.19]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 7710413AE7; 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Hallyn" , Stephen Smalley , Eric Paris , Mykola Lysenko , Shuah Khan Cc: Geliang Tang , bpf@vger.kernel.org, netdev@vger.kernel.org, mptcp@lists.linux.dev, apparmor@lists.ubuntu.com, linux-security-module@vger.kernel.org, selinux@vger.kernel.org, linux-kselftest@vger.kernel.org Subject: [PATCH bpf-next v8 4/4] selftests/bpf: Add mptcpify test Date: Thu, 3 Aug 2023 15:30:42 +0800 Message-Id: <4b95511da1a9dfd1a55734e32b7b6510739a7ab7.1691047403.git.geliang.tang@suse.com> X-Mailer: git-send-email 2.35.3 In-Reply-To: References: X-ClientProxiedBy: TYAPR01CA0036.jpnprd01.prod.outlook.com (2603:1096:404:28::24) To HE1PR0402MB3497.eurprd04.prod.outlook.com (2603:10a6:7:83::14) Precedence: bulk X-Mailing-List: bpf@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: HE1PR0402MB3497:EE_|AM9PR04MB8571:EE_ X-MS-Office365-Filtering-Correlation-Id: ca065f5a-b85f-498e-7cd8-08db93f3a1eb X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; 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It will be hooked in update_socket_protocol(). Extend the MPTCP test base, add a selftest test_mptcpify() for the mptcpify case. Open and load the mptcpify test prog to mptcpify the TCP sockets dynamically, then use start_server() and connect_to_fd() to create a TCP socket, but actually what's created is an MPTCP socket, which can be verified through the outputs of 'ss' and 'nstat' commands. Signed-off-by: Geliang Tang Reviewed-by: Matthieu Baerts --- .../testing/selftests/bpf/prog_tests/mptcp.c | 94 +++++++++++++++++++ tools/testing/selftests/bpf/progs/mptcpify.c | 25 +++++ 2 files changed, 119 insertions(+) create mode 100644 tools/testing/selftests/bpf/progs/mptcpify.c diff --git a/tools/testing/selftests/bpf/prog_tests/mptcp.c b/tools/testing/selftests/bpf/prog_tests/mptcp.c index 4407bd5c9e9a..caab3aa6a162 100644 --- a/tools/testing/selftests/bpf/prog_tests/mptcp.c +++ b/tools/testing/selftests/bpf/prog_tests/mptcp.c @@ -6,6 +6,7 @@ #include "cgroup_helpers.h" #include "network_helpers.h" #include "mptcp_sock.skel.h" +#include "mptcpify.skel.h" char NS_TEST[32]; @@ -195,8 +196,101 @@ static void test_base(void) close(cgroup_fd); } +static void send_byte(int fd) +{ + char b = 0x55; + + ASSERT_EQ(write(fd, &b, sizeof(b)), 1, "send single byte"); +} + +static int verify_mptcpify(void) +{ + char cmd[256]; + int err = 0; + + snprintf(cmd, sizeof(cmd), + "ip netns exec %s ss -tOni | grep -q '%s'", + NS_TEST, "tcp-ulp-mptcp"); + if (!ASSERT_OK(system(cmd), "No tcp-ulp-mptcp found!")) + err++; + + snprintf(cmd, sizeof(cmd), + "ip netns exec %s nstat -asz %s | awk '%s' | grep -q '%s'", + NS_TEST, "MPTcpExtMPCapableSYNACKRX", + "NR==1 {next} {print $2}", "1"); + if (!ASSERT_OK(system(cmd), "No MPTcpExtMPCapableSYNACKRX found!")) + err++; + + return err; +} + +static int run_mptcpify(int cgroup_fd) +{ + int server_fd, client_fd, prog_fd, err = 0; + struct mptcpify *mptcpify_skel; + + mptcpify_skel = mptcpify__open_and_load(); + if (!ASSERT_OK_PTR(mptcpify_skel, "skel_open_load")) + return -EIO; + + err = mptcpify__attach(mptcpify_skel); + if (!ASSERT_OK(err, "skel_attach")) + goto out; + + prog_fd = bpf_program__fd(mptcpify_skel->progs.mptcpify); + if (!ASSERT_GE(prog_fd, 0, "bpf_program__fd")) { + err = -EIO; + goto out; + } + + /* without MPTCP */ + server_fd = start_server(AF_INET, SOCK_STREAM, NULL, 0, 0); + if (!ASSERT_GE(server_fd, 0, "start_server")) { + err = -EIO; + goto out; + } + + client_fd = connect_to_fd(server_fd, 0); + if (!ASSERT_GE(client_fd, 0, "connect to fd")) { + err = -EIO; + goto close_server; + } + + send_byte(client_fd); + err += verify_mptcpify(); + + close(client_fd); +close_server: + close(server_fd); +out: + mptcpify__destroy(mptcpify_skel); + return err; +} + +static void test_mptcpify(void) +{ + struct nstoken *nstoken = NULL; + int cgroup_fd; + + cgroup_fd = test__join_cgroup("/mptcpify"); + if (!ASSERT_GE(cgroup_fd, 0, "test__join_cgroup")) + return; + + nstoken = create_netns(); + if (!ASSERT_OK_PTR(nstoken, "create_netns")) + goto fail; + + ASSERT_OK(run_mptcpify(cgroup_fd), "run_mptcpify"); + +fail: + cleanup_netns(nstoken); + close(cgroup_fd); +} + void test_mptcp(void) { if (test__start_subtest("base")) test_base(); + if (test__start_subtest("mptcpify")) + test_mptcpify(); } diff --git a/tools/testing/selftests/bpf/progs/mptcpify.c b/tools/testing/selftests/bpf/progs/mptcpify.c new file mode 100644 index 000000000000..9cf1febe982d --- /dev/null +++ b/tools/testing/selftests/bpf/progs/mptcpify.c @@ -0,0 +1,25 @@ +// SPDX-License-Identifier: GPL-2.0 +/* Copyright (c) 2023, SUSE. */ + +#include +#include + +char _license[] SEC("license") = "GPL"; + +#define AF_INET 2 +#define AF_INET6 10 +#define SOCK_STREAM 1 +#define IPPROTO_TCP 6 +#define IPPROTO_MPTCP 262 + +SEC("fmod_ret/update_socket_protocol") +int BPF_PROG(mptcpify, int family, int type, int protocol) +{ + if ((family == AF_INET || family == AF_INET6) && + type == SOCK_STREAM && + (!protocol || protocol == IPPROTO_TCP)) { + return IPPROTO_MPTCP; + } + + return protocol; +}