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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 1/6] net: socket: add update_socket_protocol hook Date: Sat, 29 Jul 2023 17:57:22 +0800 Message-Id: X-Mailer: git-send-email 2.35.3 In-Reply-To: References: X-ClientProxiedBy: SG2PR02CA0101.apcprd02.prod.outlook.com (2603:1096:4:92::17) 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: 51060d3e-b7a2-4139-105a-08db901a371d 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)(6486002)(6512007)(6666004)(186003)(6506007)(26005)(7416002)(7406005)(8936002)(2906002)(41300700001)(44832011)(2616005)(36756003)(15650500001)(83380400001);DIR:OUT;SFP:1101; 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One user case is to force legacy TCP apps to create and use MPTCP sockets instead of TCP ones. Signed-off-by: Geliang Tang --- net/socket.c | 26 ++++++++++++++++++++++++++ 1 file changed, 26 insertions(+) diff --git a/net/socket.c b/net/socket.c index 2b0e54b2405c..6837a517ac9f 100644 --- a/net/socket.c +++ b/net/socket.c @@ -1644,11 +1644,37 @@ 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); + if (protocol < 0 || protocol >= IPPROTO_MAX) + return -EINVAL; + sock = __sys_socket_create(family, type, protocol); if (IS_ERR(sock)) return PTR_ERR(sock);