From patchwork Wed Sep 27 22:58:05 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Andrii Nakryiko X-Patchwork-Id: 13401777 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 A8FFAE80ABF for ; Wed, 27 Sep 2023 23:02:20 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229978AbjI0XCU convert rfc822-to-8bit (ORCPT ); Wed, 27 Sep 2023 19:02:20 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:45176 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229959AbjI0XB6 (ORCPT ); Wed, 27 Sep 2023 19:01:58 -0400 Received: from mx0a-00082601.pphosted.com (mx0b-00082601.pphosted.com [67.231.153.30]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 7DE5DF9 for ; Wed, 27 Sep 2023 16:01:56 -0700 (PDT) Received: from pps.filterd (m0001303.ppops.net [127.0.0.1]) by m0001303.ppops.net (8.17.1.19/8.17.1.19) with ESMTP id 38RKBOcm018679 for ; Wed, 27 Sep 2023 16:01:55 -0700 Received: from maileast.thefacebook.com ([163.114.130.16]) by m0001303.ppops.net (PPS) with ESMTPS id 3tcpcxvmpx-9 (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128 verify=NOT) for ; Wed, 27 Sep 2023 16:01:55 -0700 Received: from twshared44805.48.prn1.facebook.com (2620:10d:c0a8:1c::1b) by mail.thefacebook.com (2620:10d:c0a8:83::8) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2507.23; Wed, 27 Sep 2023 16:01:45 -0700 Received: by devbig019.vll3.facebook.com (Postfix, from userid 137359) id 4713138C9A6E7; Wed, 27 Sep 2023 15:58:55 -0700 (PDT) From: Andrii Nakryiko To: , CC: , , , , , , Subject: [PATCH v6 bpf-next 09/13] libbpf: add bpf_token_create() API Date: Wed, 27 Sep 2023 15:58:05 -0700 Message-ID: <20230927225809.2049655-10-andrii@kernel.org> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20230927225809.2049655-1-andrii@kernel.org> References: <20230927225809.2049655-1-andrii@kernel.org> MIME-Version: 1.0 X-FB-Internal: Safe X-Proofpoint-ORIG-GUID: EZXWfhJZvJVg4RLqaVCNCfR_hw2anwco X-Proofpoint-GUID: EZXWfhJZvJVg4RLqaVCNCfR_hw2anwco X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.267,Aquarius:18.0.980,Hydra:6.0.619,FMLib:17.11.176.26 definitions=2023-09-27_15,2023-09-27_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 | 28 ++++++++++++++++++++++++++++ tools/lib/bpf/libbpf.map | 1 + 3 files changed, 48 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..a5ddb0393fee 100644 --- a/tools/lib/bpf/bpf.h +++ b/tools/lib/bpf/bpf.h @@ -635,6 +635,34 @@ 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 derived + * from specified BPF FS mount point. + * + * BPF token created with this API can be passed to bpf() syscall for + * commands like BPF_PROG_LOAD, BPF_MAP_CREATE, etc. + * + * @param bpffs_path_fd O_PATH FD (see man 2 openat() for semantics) specifying, + * in combination with *bpffs_pathname*, BPF FS mount from which to derive + * a BPF token instance. + * @param pin_pathname absolute or relative path specifying,in combination + * with *bpffs_pathname*, BPF FS mount from which to derive a BPF token + * instance. + * @param opts optional BPF token creation options, can be NULL + * + * @return BPF token FD > 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 cc973b678a39..9d05ebcd3a9e 100644 --- a/tools/lib/bpf/libbpf.map +++ b/tools/lib/bpf/libbpf.map @@ -400,6 +400,7 @@ LIBBPF_1.3.0 { bpf_program__attach_netfilter; bpf_program__attach_tcx; bpf_program__attach_uprobe_multi; + bpf_token_create; ring__avail_data_size; ring__consume; ring__consumer_pos;