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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 0/4] bpf: Force to MPTCP Date: Thu, 3 Aug 2023 15:30:38 +0800 Message-Id: X-Mailer: git-send-email 2.35.3 X-ClientProxiedBy: TYAPR01CA0095.jpnprd01.prod.outlook.com (2603:1096:404:2c::35) To HE1PR0402MB3497.eurprd04.prod.outlook.com (2603:10a6:7:83::14) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: HE1PR0402MB3497:EE_|AM9PR04MB8571:EE_ X-MS-Office365-Filtering-Correlation-Id: 8a2dd2b7-692f-4c37-5ae0-08db93f38829 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)(110136005)(6486002)(41300700001)(478600001)(7416002)(5660300002)(8936002)(8676002)(7406005)(186003)(4326008)(6512007)(966005)(316002)(66476007)(26005)(6506007)(66556008)(66946007)(2616005)(2906002)(83380400001)(44832011)(36756003)(38100700002)(921005)(86362001)(13296009);DIR:OUT;SFP:1101; X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: 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 X-OriginatorOrg: suse.com X-MS-Exchange-CrossTenant-Network-Message-Id: 8a2dd2b7-692f-4c37-5ae0-08db93f38829 X-MS-Exchange-CrossTenant-AuthSource: HE1PR0402MB3497.eurprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 03 Aug 2023 07:30:37.7475 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: f7a17af6-1c5c-4a36-aa8b-f5be247aa4ba X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: Eo2o9q+ep6x+gORrupfJBJZvBkFrM+2jzzkFNlVWaWk5407uB5qwRgMEObmgk53hUWc0GnUiO8ht4hxyudduuQ== X-MS-Exchange-Transport-CrossTenantHeadersStamped: AM9PR04MB8571 Precedence: bulk List-ID: As is described in the "How to use MPTCP?" section in MPTCP wiki [1]: "Your app should create sockets with IPPROTO_MPTCP as the proto: ( socket(AF_INET, SOCK_STREAM, IPPROTO_MPTCP); ). Legacy apps can be forced to create and use MPTCP sockets instead of TCP ones via the mptcpize command bundled with the mptcpd daemon." But the mptcpize (LD_PRELOAD technique) command has some limitations [2]: - it doesn't work if the application is not using libc (e.g. GoLang apps) - in some envs, it might not be easy to set env vars / change the way apps are launched, e.g. on Android - mptcpize needs to be launched with all apps that want MPTCP: we could have more control from BPF to enable MPTCP only for some apps or all the ones of a netns or a cgroup, etc. - it is not in BPF, we cannot talk about it at netdev conf. So this patchset attempts to use BPF to implement functions similer to mptcpize. The main idea is to add a hook in sys_socket() to change the protocol id from IPPROTO_TCP (or 0) to IPPROTO_MPTCP. [1] https://github.com/multipath-tcp/mptcp_net-next/wiki [2] https://github.com/multipath-tcp/mptcp_net-next/issues/79 v8: - drop the additional checks on the 'protocol' value after the 'update_socket_protocol()' call. v7: - add __weak and __diag_* for update_socket_protocol. v6: - add update_socket_protocol. v5: - add bpf_mptcpify helper. v4: - use lsm_cgroup/socket_create v3: - patch 8: char cmd[128]; -> char cmd[256]; v2: - Fix build selftests errors reported by CI Closes: https://github.com/multipath-tcp/mptcp_net-next/issues/79 Geliang Tang (4): bpf: Add update_socket_protocol hook selftests/bpf: Use random netns name for mptcp selftests/bpf: Add two mptcp netns helpers selftests/bpf: Add mptcpify test net/mptcp/bpf.c | 17 +++ net/socket.c | 25 ++++ .../testing/selftests/bpf/prog_tests/mptcp.c | 125 ++++++++++++++++-- tools/testing/selftests/bpf/progs/mptcpify.c | 25 ++++ 4 files changed, 183 insertions(+), 9 deletions(-) create mode 100644 tools/testing/selftests/bpf/progs/mptcpify.c