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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: [RFC bpf-next v7 0/6] bpf: Force to MPTCP Date: Sat, 29 Jul 2023 17:57:21 +0800 Message-Id: X-Mailer: git-send-email 2.35.3 X-ClientProxiedBy: SG2PR02CA0105.apcprd02.prod.outlook.com (2603:1096:4:92::21) 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_|GVXPR04MB9733:EE_ X-MS-Office365-Filtering-Correlation-Id: 54fe800b-5459-4069-2909-08db901a322b 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)(39860400002)(366004)(396003)(136003)(451199021)(316002)(8676002)(110136005)(478600001)(38100700002)(66556008)(921005)(86362001)(5660300002)(4326008)(66946007)(66476007)(966005)(6486002)(6512007)(6666004)(186003)(6506007)(26005)(7416002)(7406005)(8936002)(2906002)(41300700001)(44832011)(2616005)(36756003)(83380400001);DIR:OUT;SFP:1101; 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). 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 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 (6): net: socket: add update_socket_protocol hook bpf: Register mptcp modret set selftests/bpf: Add mptcpify program selftests/bpf: use random netns name for mptcp selftests/bpf: add two mptcp netns helpers selftests/bpf: Add mptcpify selftest net/mptcp/bpf.c | 17 +++ net/socket.c | 26 ++++ .../testing/selftests/bpf/prog_tests/mptcp.c | 125 ++++++++++++++++-- tools/testing/selftests/bpf/progs/mptcpify.c | 25 ++++ 4 files changed, 184 insertions(+), 9 deletions(-) create mode 100644 tools/testing/selftests/bpf/progs/mptcpify.c