From patchwork Fri Mar 18 16:15:15 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Benjamin Tissoires X-Patchwork-Id: 552898 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 9758CC3527D for ; Fri, 18 Mar 2022 16:17:57 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S238847AbiCRQTN (ORCPT ); Fri, 18 Mar 2022 12:19:13 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:57222 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S238835AbiCRQSM (ORCPT ); Fri, 18 Mar 2022 12:18:12 -0400 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.129.124]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id 705001D7891 for ; Fri, 18 Mar 2022 09:16:40 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1647620199; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=8pb2b2yBvlyePXc4neaXnpSmeAYYQklyRoO6YAaoGbs=; b=eK3iiVJSja3Hau6Z3tsUA0HnYwgMfWa5nhQ16vvipfBRuoHhyST1n1X8YriL32Y2XBMR3i CkVQUnsXX1mlGa94XWY2+CCd90NE8XeWUZSHniE3GELkIKjP+E/HMtg+HVrRxPqgibGFzK cMG1CvKBc9cppD4cekVPWxDQdC06AQo= Received: from mimecast-mx02.redhat.com (mimecast-mx02.redhat.com [66.187.233.88]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-137-AanS3ePaM0SrClnrgLZ8Og-1; Fri, 18 Mar 2022 12:16:35 -0400 X-MC-Unique: AanS3ePaM0SrClnrgLZ8Og-1 Received: from smtp.corp.redhat.com (int-mx05.intmail.prod.int.rdu2.redhat.com [10.11.54.5]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id D9A6C899EC1; Fri, 18 Mar 2022 16:16:28 +0000 (UTC) Received: from plouf.redhat.com (unknown [10.39.192.159]) by smtp.corp.redhat.com (Postfix) with ESMTP id 95DC833250; Fri, 18 Mar 2022 16:16:22 +0000 (UTC) From: Benjamin Tissoires To: Greg KH , Jiri Kosina , Alexei Starovoitov , Daniel Borkmann , Andrii Nakryiko , Martin KaFai Lau , Song Liu , Yonghong Song , John Fastabend , KP Singh , Shuah Khan , Dave Marchevsky , Joe Stringer , Jonathan Corbet Cc: Tero Kristo , linux-kernel@vger.kernel.org, linux-input@vger.kernel.org, netdev@vger.kernel.org, bpf@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-doc@vger.kernel.org, Benjamin Tissoires Subject: [PATCH bpf-next v3 04/17] libbpf: add HID program type and API Date: Fri, 18 Mar 2022 17:15:15 +0100 Message-Id: <20220318161528.1531164-5-benjamin.tissoires@redhat.com> In-Reply-To: <20220318161528.1531164-1-benjamin.tissoires@redhat.com> References: <20220318161528.1531164-1-benjamin.tissoires@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.11.54.5 Precedence: bulk List-ID: X-Mailing-List: linux-input@vger.kernel.org HID-bpf program type are needing new SECs. To bind a hid-bpf program, we can rely on bpf_program__attach_fd() so export a new function to the API. Signed-off-by: Benjamin Tissoires Acked-by: Song Liu --- changes in v3: - squashed the libbpf changes into 1 - moved bpf_program__attach_hid to 0.8.0 - added SEC_DEF("hid/driver_event") changes in v2: - split the series by bpf/libbpf/hid/selftests and samples --- tools/include/uapi/linux/bpf.h | 31 +++++++++++++++++++++++++++++++ tools/lib/bpf/libbpf.c | 23 +++++++++++++++++------ tools/lib/bpf/libbpf.h | 2 ++ tools/lib/bpf/libbpf.map | 1 + 4 files changed, 51 insertions(+), 6 deletions(-) diff --git a/tools/include/uapi/linux/bpf.h b/tools/include/uapi/linux/bpf.h index 99fab54ae9c0..0e8438e93768 100644 --- a/tools/include/uapi/linux/bpf.h +++ b/tools/include/uapi/linux/bpf.h @@ -952,6 +952,7 @@ enum bpf_prog_type { BPF_PROG_TYPE_LSM, BPF_PROG_TYPE_SK_LOOKUP, BPF_PROG_TYPE_SYSCALL, /* a program that can execute syscalls */ + BPF_PROG_TYPE_HID, }; enum bpf_attach_type { @@ -997,6 +998,10 @@ enum bpf_attach_type { BPF_SK_REUSEPORT_SELECT, BPF_SK_REUSEPORT_SELECT_OR_MIGRATE, BPF_PERF_EVENT, + BPF_HID_DEVICE_EVENT, + BPF_HID_RDESC_FIXUP, + BPF_HID_USER_EVENT, + BPF_HID_DRIVER_EVENT, __MAX_BPF_ATTACH_TYPE }; @@ -1011,6 +1016,7 @@ enum bpf_link_type { BPF_LINK_TYPE_NETNS = 5, BPF_LINK_TYPE_XDP = 6, BPF_LINK_TYPE_PERF_EVENT = 7, + BPF_LINK_TYPE_HID = 8, MAX_BPF_LINK_TYPE, }; @@ -1118,6 +1124,16 @@ enum bpf_link_type { */ #define BPF_F_XDP_HAS_FRAGS (1U << 5) +/* HID flag used in BPF_LINK_CREATE command + * + * NONE(default): The bpf program will be added at the tail of the list + * of existing bpf program for this type. + * + * BPF_F_INSERT_HEAD: The bpf program will be added at the beginning + * of the list of existing bpf program for this type.. + */ +#define BPF_F_INSERT_HEAD (1U << 0) + /* When BPF ldimm64's insn[0].src_reg != 0 then this can have * the following extensions: * @@ -5129,6 +5145,16 @@ union bpf_attr { * The **hash_algo** is returned on success, * **-EOPNOTSUP** if the hash calculation failed or **-EINVAL** if * invalid arguments are passed. + * + * void *bpf_hid_get_data(void *ctx, u64 offset, u64 size) + * Description + * Returns a pointer to the data associated with context at the given + * offset and size (in bytes). + * + * Note: the returned pointer is refcounted and must be dereferenced + * by a call to bpf_hid_discard; + * Return + * The pointer to the data. On error, a null value is returned. */ #define __BPF_FUNC_MAPPER(FN) \ FN(unspec), \ @@ -5325,6 +5351,7 @@ union bpf_attr { FN(copy_from_user_task), \ FN(skb_set_tstamp), \ FN(ima_file_hash), \ + FN(hid_get_data), \ /* */ /* integer value in 'imm' field of BPF_CALL instruction selects which helper @@ -5925,6 +5952,10 @@ struct bpf_link_info { struct { __u32 ifindex; } xdp; + struct { + __s32 hidraw_number; + __u32 attach_type; + } hid; }; } __attribute__((aligned(8))); diff --git a/tools/lib/bpf/libbpf.c b/tools/lib/bpf/libbpf.c index 43161fdd44bb..6b9ba313eb5b 100644 --- a/tools/lib/bpf/libbpf.c +++ b/tools/lib/bpf/libbpf.c @@ -8675,6 +8675,10 @@ static const struct bpf_sec_def section_defs[] = { SEC_DEF("cgroup/setsockopt", CGROUP_SOCKOPT, BPF_CGROUP_SETSOCKOPT, SEC_ATTACHABLE | SEC_SLOPPY_PFX), SEC_DEF("struct_ops+", STRUCT_OPS, 0, SEC_NONE), SEC_DEF("sk_lookup", SK_LOOKUP, BPF_SK_LOOKUP, SEC_ATTACHABLE | SEC_SLOPPY_PFX), + SEC_DEF("hid/device_event", HID, BPF_HID_DEVICE_EVENT, SEC_ATTACHABLE_OPT), + SEC_DEF("hid/rdesc_fixup", HID, BPF_HID_RDESC_FIXUP, SEC_ATTACHABLE_OPT), + SEC_DEF("hid/user_event", HID, BPF_HID_USER_EVENT, SEC_ATTACHABLE_OPT), + SEC_DEF("hid/driver_event", HID, BPF_HID_DRIVER_EVENT, SEC_ATTACHABLE_OPT), }; static size_t custom_sec_def_cnt; @@ -10630,10 +10634,11 @@ static int attach_lsm(const struct bpf_program *prog, long cookie, struct bpf_li static struct bpf_link * bpf_program__attach_fd(const struct bpf_program *prog, int target_fd, int btf_id, - const char *target_name) + const char *target_name, __u32 flags) { DECLARE_LIBBPF_OPTS(bpf_link_create_opts, opts, - .target_btf_id = btf_id); + .target_btf_id = btf_id, + .flags = flags); enum bpf_attach_type attach_type; char errmsg[STRERR_BUFSIZE]; struct bpf_link *link; @@ -10667,19 +10672,19 @@ bpf_program__attach_fd(const struct bpf_program *prog, int target_fd, int btf_id struct bpf_link * bpf_program__attach_cgroup(const struct bpf_program *prog, int cgroup_fd) { - return bpf_program__attach_fd(prog, cgroup_fd, 0, "cgroup"); + return bpf_program__attach_fd(prog, cgroup_fd, 0, "cgroup", 0); } struct bpf_link * bpf_program__attach_netns(const struct bpf_program *prog, int netns_fd) { - return bpf_program__attach_fd(prog, netns_fd, 0, "netns"); + return bpf_program__attach_fd(prog, netns_fd, 0, "netns", 0); } struct bpf_link *bpf_program__attach_xdp(const struct bpf_program *prog, int ifindex) { /* target_fd/target_ifindex use the same field in LINK_CREATE */ - return bpf_program__attach_fd(prog, ifindex, 0, "xdp"); + return bpf_program__attach_fd(prog, ifindex, 0, "xdp", 0); } struct bpf_link *bpf_program__attach_freplace(const struct bpf_program *prog, @@ -10705,7 +10710,7 @@ struct bpf_link *bpf_program__attach_freplace(const struct bpf_program *prog, if (btf_id < 0) return libbpf_err_ptr(btf_id); - return bpf_program__attach_fd(prog, target_fd, btf_id, "freplace"); + return bpf_program__attach_fd(prog, target_fd, btf_id, "freplace", 0); } else { /* no target, so use raw_tracepoint_open for compatibility * with old kernels @@ -10760,6 +10765,12 @@ static int attach_iter(const struct bpf_program *prog, long cookie, struct bpf_l return libbpf_get_error(*link); } +struct bpf_link * +bpf_program__attach_hid(const struct bpf_program *prog, int hid_fd, __u32 flags) +{ + return bpf_program__attach_fd(prog, hid_fd, 0, "hid", flags); +} + struct bpf_link *bpf_program__attach(const struct bpf_program *prog) { struct bpf_link *link = NULL; diff --git a/tools/lib/bpf/libbpf.h b/tools/lib/bpf/libbpf.h index c1b0c2ef14d8..13dff4865da5 100644 --- a/tools/lib/bpf/libbpf.h +++ b/tools/lib/bpf/libbpf.h @@ -529,6 +529,8 @@ struct bpf_iter_attach_opts { LIBBPF_API struct bpf_link * bpf_program__attach_iter(const struct bpf_program *prog, const struct bpf_iter_attach_opts *opts); +LIBBPF_API struct bpf_link * +bpf_program__attach_hid(const struct bpf_program *prog, int hid_fd, __u32 flags); /* * Libbpf allows callers to adjust BPF programs before being loaded diff --git a/tools/lib/bpf/libbpf.map b/tools/lib/bpf/libbpf.map index df1b947792c8..cd8da9a8bf36 100644 --- a/tools/lib/bpf/libbpf.map +++ b/tools/lib/bpf/libbpf.map @@ -442,6 +442,7 @@ LIBBPF_0.7.0 { LIBBPF_0.8.0 { global: + bpf_program__attach_hid; libbpf_register_prog_handler; libbpf_unregister_prog_handler; } LIBBPF_0.7.0;