From patchwork Thu Jun 2 14:37:40 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Roberto Sassu X-Patchwork-Id: 578797 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 EB179CCA478 for ; Thu, 2 Jun 2022 14:38:21 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S236050AbiFBOiP (ORCPT ); Thu, 2 Jun 2022 10:38:15 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:44160 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S236002AbiFBOiI (ORCPT ); Thu, 2 Jun 2022 10:38:08 -0400 Received: from frasgout.his.huawei.com (frasgout.his.huawei.com [185.176.79.56]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id E3CD81248CD; Thu, 2 Jun 2022 07:38:06 -0700 (PDT) Received: from fraeml714-chm.china.huawei.com (unknown [172.18.147.201]) by frasgout.his.huawei.com (SkyGuard) with ESMTP id 4LDT5r2P5yz67bVY; Thu, 2 Jun 2022 22:33:36 +0800 (CST) Received: from roberto-ThinkStation-P620.huawei.com (10.204.63.22) by fraeml714-chm.china.huawei.com (10.206.15.33) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2375.24; Thu, 2 Jun 2022 16:38:04 +0200 From: Roberto Sassu To: , , , CC: , , , , Roberto Sassu Subject: [PATCH v2 1/9] libbpf: Introduce bpf_map_get_fd_by_id_flags() Date: Thu, 2 Jun 2022 16:37:40 +0200 Message-ID: <20220602143748.673971-2-roberto.sassu@huawei.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20220602143748.673971-1-roberto.sassu@huawei.com> References: <20220602143748.673971-1-roberto.sassu@huawei.com> MIME-Version: 1.0 X-Originating-IP: [10.204.63.22] X-ClientProxiedBy: lhreml754-chm.china.huawei.com (10.201.108.204) To fraeml714-chm.china.huawei.com (10.206.15.33) X-CFilter-Loop: Reflected Precedence: bulk List-ID: X-Mailing-List: linux-kselftest@vger.kernel.org Introduce bpf_map_get_fd_by_id_flags(), to let a caller specify the open flags needed for the operation. This could make an operation succeed, if access to a map is restricted (i.e. it allows only certain operations). Signed-off-by: Roberto Sassu --- tools/lib/bpf/bpf.c | 8 +++++++- tools/lib/bpf/bpf.h | 1 + tools/lib/bpf/libbpf.map | 1 + 3 files changed, 9 insertions(+), 1 deletion(-) diff --git a/tools/lib/bpf/bpf.c b/tools/lib/bpf/bpf.c index 240186aac8e6..33bac2006043 100644 --- a/tools/lib/bpf/bpf.c +++ b/tools/lib/bpf/bpf.c @@ -1047,18 +1047,24 @@ int bpf_prog_get_fd_by_id(__u32 id) return libbpf_err_errno(fd); } -int bpf_map_get_fd_by_id(__u32 id) +int bpf_map_get_fd_by_id_flags(__u32 id, __u32 flags) { union bpf_attr attr; int fd; memset(&attr, 0, sizeof(attr)); attr.map_id = id; + attr.open_flags = flags; fd = sys_bpf_fd(BPF_MAP_GET_FD_BY_ID, &attr, sizeof(attr)); return libbpf_err_errno(fd); } +int bpf_map_get_fd_by_id(__u32 id) +{ + return bpf_map_get_fd_by_id_flags(id, 0); +} + int bpf_btf_get_fd_by_id(__u32 id) { union bpf_attr attr; diff --git a/tools/lib/bpf/bpf.h b/tools/lib/bpf/bpf.h index cabc03703e29..20e4c852362d 100644 --- a/tools/lib/bpf/bpf.h +++ b/tools/lib/bpf/bpf.h @@ -438,6 +438,7 @@ LIBBPF_API int bpf_map_get_next_id(__u32 start_id, __u32 *next_id); LIBBPF_API int bpf_btf_get_next_id(__u32 start_id, __u32 *next_id); LIBBPF_API int bpf_link_get_next_id(__u32 start_id, __u32 *next_id); LIBBPF_API int bpf_prog_get_fd_by_id(__u32 id); +LIBBPF_API int bpf_map_get_fd_by_id_flags(__u32 id, __u32 flags); LIBBPF_API int bpf_map_get_fd_by_id(__u32 id); LIBBPF_API int bpf_btf_get_fd_by_id(__u32 id); LIBBPF_API int bpf_link_get_fd_by_id(__u32 id); diff --git a/tools/lib/bpf/libbpf.map b/tools/lib/bpf/libbpf.map index 38e284ff057d..019278e66836 100644 --- a/tools/lib/bpf/libbpf.map +++ b/tools/lib/bpf/libbpf.map @@ -466,6 +466,7 @@ LIBBPF_1.0.0 { libbpf_bpf_link_type_str; libbpf_bpf_map_type_str; libbpf_bpf_prog_type_str; + bpf_map_get_fd_by_id_flags; local: *; };