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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) 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; 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: 51060d3e-b7a2-4139-105a-08db901a371d X-MS-Exchange-CrossTenant-AuthSource: HE1PR0402MB3497.eurprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 29 Jul 2023 09:57:27.4710 (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: Iw9BOxp+zLyyEO9RqxZXCe9qtJTu4A8AIPVLQBlYMbZ9g0uNiiFQb5PGBRcw7EEYxzuaCWl3gzuCcDRuzbVxNg== X-MS-Exchange-Transport-CrossTenantHeadersStamped: GVXPR04MB9733 Precedence: bulk List-ID: X-Mailing-List: linux-kselftest@vger.kernel.org Add a hook named update_socket_protocol in __sys_socket(), for bpf progs to attach to and update socket protocol. 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);