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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) 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; 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)(15650500001)(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: 602f81aa-90a5-4ff5-e34d-08db93f38f2e X-MS-Exchange-CrossTenant-AuthSource: HE1PR0402MB3497.eurprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 03 Aug 2023 07:30:49.5182 (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: BAxDRXM23xoUk1SWG0V5X7EKJBqjTW2D3MqeZ6VZcm6HyaiPEx8CO418m8TpzOLx7YLfJxSzKKHxU8CxjAA+QQ== X-MS-Exchange-Transport-CrossTenantHeadersStamped: AM9PR04MB8571 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. 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);