From patchwork Tue Sep 12 21:29:02 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Andrii Nakryiko X-Patchwork-Id: 13382168 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id EA524EE3F3B for ; Tue, 12 Sep 2023 21:29:34 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233332AbjILV3h convert rfc822-to-8bit (ORCPT ); Tue, 12 Sep 2023 17:29:37 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:36572 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233855AbjILV3f (ORCPT ); Tue, 12 Sep 2023 17:29:35 -0400 Received: from mx0a-00082601.pphosted.com (mx0a-00082601.pphosted.com [67.231.145.42]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id CDF0110DD for ; Tue, 12 Sep 2023 14:29:29 -0700 (PDT) Received: from pps.filterd (m0109333.ppops.net [127.0.0.1]) by mx0a-00082601.pphosted.com (8.17.1.19/8.17.1.19) with ESMTP id 38CKgRPZ028734 for ; Tue, 12 Sep 2023 14:29:29 -0700 Received: from mail.thefacebook.com ([163.114.132.120]) by mx0a-00082601.pphosted.com (PPS) with ESMTPS id 3t2y8t8e1g-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128 verify=NOT) for ; Tue, 12 Sep 2023 14:29:29 -0700 Received: from twshared52565.14.frc2.facebook.com (2620:10d:c085:108::4) by mail.thefacebook.com (2620:10d:c085:21d::8) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2507.23; Tue, 12 Sep 2023 14:29:28 -0700 Received: by devbig019.vll3.facebook.com (Postfix, from userid 137359) id 97A0037F4072A; Tue, 12 Sep 2023 14:29:25 -0700 (PDT) From: Andrii Nakryiko To: CC: , , , , , , Subject: [PATCH v4 bpf-next 08/12] libbpf: add bpf_token_create() API Date: Tue, 12 Sep 2023 14:29:02 -0700 Message-ID: <20230912212906.3975866-9-andrii@kernel.org> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20230912212906.3975866-1-andrii@kernel.org> References: <20230912212906.3975866-1-andrii@kernel.org> MIME-Version: 1.0 X-FB-Internal: Safe X-Proofpoint-GUID: tUHbTe_jN8kiGe7t80KXK6eqKYB4OJjU X-Proofpoint-ORIG-GUID: tUHbTe_jN8kiGe7t80KXK6eqKYB4OJjU X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.267,Aquarius:18.0.957,Hydra:6.0.601,FMLib:17.11.176.26 definitions=2023-09-12_20,2023-09-05_01,2023-05-22_02 Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org Add low-level wrapper API for BPF_TOKEN_CREATE command in bpf() syscall. Signed-off-by: Andrii Nakryiko --- tools/lib/bpf/bpf.c | 19 +++++++++++++++++++ tools/lib/bpf/bpf.h | 29 +++++++++++++++++++++++++++++ tools/lib/bpf/libbpf.map | 1 + 3 files changed, 49 insertions(+) diff --git a/tools/lib/bpf/bpf.c b/tools/lib/bpf/bpf.c index b0f1913763a3..593ff9ea120d 100644 --- a/tools/lib/bpf/bpf.c +++ b/tools/lib/bpf/bpf.c @@ -1271,3 +1271,22 @@ int bpf_prog_bind_map(int prog_fd, int map_fd, ret = sys_bpf(BPF_PROG_BIND_MAP, &attr, attr_sz); return libbpf_err_errno(ret); } + +int bpf_token_create(int bpffs_path_fd, const char *bpffs_pathname, + struct bpf_token_create_opts *opts) +{ + const size_t attr_sz = offsetofend(union bpf_attr, token_create); + union bpf_attr attr; + int fd; + + if (!OPTS_VALID(opts, bpf_token_create_opts)) + return libbpf_err(-EINVAL); + + memset(&attr, 0, attr_sz); + attr.token_create.bpffs_path_fd = bpffs_path_fd; + attr.token_create.bpffs_pathname = ptr_to_u64(bpffs_pathname); + attr.token_create.flags = OPTS_GET(opts, flags, 0); + + fd = sys_bpf_fd(BPF_TOKEN_CREATE, &attr, attr_sz); + return libbpf_err_errno(fd); +} diff --git a/tools/lib/bpf/bpf.h b/tools/lib/bpf/bpf.h index 74c2887cfd24..16d5c257066c 100644 --- a/tools/lib/bpf/bpf.h +++ b/tools/lib/bpf/bpf.h @@ -635,6 +635,35 @@ struct bpf_test_run_opts { LIBBPF_API int bpf_prog_test_run_opts(int prog_fd, struct bpf_test_run_opts *opts); +struct bpf_token_create_opts { + size_t sz; /* size of this struct for forward/backward compatibility */ + __u32 flags; + size_t :0; +}; +#define bpf_token_create_opts__last_field flags + +/** + * @brief **bpf_token_create()** creates a new instance of BPF token, pinning + * it at the specified location in BPF FS. + * + * BPF token created and pinned with this API can be subsequently opened using + * bpf_obj_get() API to obtain FD that can be passed to bpf() syscall for + * commands like BPF_PROG_LOAD, BPF_MAP_CREATE, etc. + * + * @param pin_path_fd O_PATH FD (see man 2 openat() for semantics) specifying, + * in combination with *pin_pathname*, target location in BPF FS at which to + * create and pin BPF token. + * @param pin_pathname absolute or relative path specifying, in combination + * with *pin_path_fd*, specifying in combination with *pin_path_fd*, target + * location in BPF FS at which to create and pin BPF token. + * @param opts optional BPF token creation options, can be NULL + * + * @return 0, on success; negative error code, otherwise (errno is also set to + * the error code) + */ +LIBBPF_API int bpf_token_create(int bpffs_path_fd, const char *bpffs_pathname, + struct bpf_token_create_opts *opts); + #ifdef __cplusplus } /* extern "C" */ #endif diff --git a/tools/lib/bpf/libbpf.map b/tools/lib/bpf/libbpf.map index 57712321490f..c45c28a5e14c 100644 --- a/tools/lib/bpf/libbpf.map +++ b/tools/lib/bpf/libbpf.map @@ -400,4 +400,5 @@ LIBBPF_1.3.0 { bpf_program__attach_netfilter; bpf_program__attach_tcx; bpf_program__attach_uprobe_multi; + bpf_token_create; } LIBBPF_1.2.0;