From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from lindbergh.monkeyblade.net (lindbergh.monkeyblade.net [23.128.96.19]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 5A641405D0; Tue, 24 Oct 2023 21:49:22 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=iogearbox.net header.i=@iogearbox.net header.b="OQA8Qn2e" Received: from www62.your-server.de (www62.your-server.de [213.133.104.62]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 8C172133; Tue, 24 Oct 2023 14:49:19 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=iogearbox.net; s=default2302; h=Content-Transfer-Encoding:MIME-Version: References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From:Sender:Reply-To: Content-Type:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID; bh=m7lZMBGRPz/nR2snBSvWzbh7UOoD6fjaltIORjTvn8Y=; b=OQA8Qn2ef+kHlqrv5Ta92DXt+E LXgmEYhdvUGPhXfeV0bpDqJNrCjSg4vXX3uWhjjm866b/0IA6OyshJmWUrDZWRn2AGYMrEZjhSuHL D/tcbKsJo5PmkFukNmzwvxTRL69DgQwlYpDXikAGocJv8QlnCMxJH2EUQ5sMAT+iFJMg+9vNmMyVG Q5Nf2O4wsyz437htrsHBTtT2ptyCkhs3wPdcSlOV/tXOLrRzfRx11a1L/6HbHewzNs/pIK9MDFCog ZvhfhpJS/tDXg1YWomNUkdt69oujdqCwa5Iv8X9A5b7KQmFSvur+byNQ1/Fzt0B+bpwFjviyeMXiE sg7xjNOw==; Received: from 40.248.197.178.dynamic.dsl-lte-bonding.zhbmb00p-msn.res.cust.swisscom.ch ([178.197.248.40] helo=localhost) by www62.your-server.de with esmtpsa (TLS1.3) tls TLS_AES_256_GCM_SHA384 (Exim 4.94.2) (envelope-from ) id 1qvPGz-0001kq-6s; Tue, 24 Oct 2023 23:49:13 +0200 From: Daniel Borkmann To: bpf@vger.kernel.org Cc: netdev@vger.kernel.org, martin.lau@linux.dev, razor@blackwall.org, ast@kernel.org, andrii@kernel.org, john.fastabend@gmail.com, sdf@google.com, toke@kernel.org, kuba@kernel.org, andrew@lunn.ch, Daniel Borkmann Subject: [PATCH bpf-next v4 3/7] libbpf: Add link-based API for netkit Date: Tue, 24 Oct 2023 23:49:00 +0200 Message-Id: <20231024214904.29825-4-daniel@iogearbox.net> X-Mailer: git-send-email 2.21.0 In-Reply-To: <20231024214904.29825-1-daniel@iogearbox.net> References: <20231024214904.29825-1-daniel@iogearbox.net> Precedence: bulk X-Mailing-List: bpf@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Authenticated-Sender: daniel@iogearbox.net X-Virus-Scanned: Clear (ClamAV 0.103.10/27071/Tue Oct 24 09:43:50 2023) X-Spam-Level: * This adds bpf_program__attach_netkit() API to libbpf. Overall it is very similar to tcx. The API looks as following: LIBBPF_API struct bpf_link * bpf_program__attach_netkit(const struct bpf_program *prog, int ifindex, const struct bpf_netkit_opts *opts); The struct bpf_netkit_opts is done in similar way as struct bpf_tcx_opts for supporting bpf_mprog control parameters. The attach location for the primary and peer device is derived from the program section "netkit/primary" and "netkit/peer", respectively. Signed-off-by: Daniel Borkmann --- tools/lib/bpf/bpf.c | 16 ++++++++++++++++ tools/lib/bpf/bpf.h | 5 +++++ tools/lib/bpf/libbpf.c | 39 +++++++++++++++++++++++++++++++++++++++ tools/lib/bpf/libbpf.h | 15 +++++++++++++++ tools/lib/bpf/libbpf.map | 1 + 5 files changed, 76 insertions(+) diff --git a/tools/lib/bpf/bpf.c b/tools/lib/bpf/bpf.c index b0f1913763a3..9dc9625651dc 100644 --- a/tools/lib/bpf/bpf.c +++ b/tools/lib/bpf/bpf.c @@ -810,6 +810,22 @@ int bpf_link_create(int prog_fd, int target_fd, if (!OPTS_ZEROED(opts, tcx)) return libbpf_err(-EINVAL); break; + case BPF_NETKIT_PRIMARY: + case BPF_NETKIT_PEER: + relative_fd = OPTS_GET(opts, netkit.relative_fd, 0); + relative_id = OPTS_GET(opts, netkit.relative_id, 0); + if (relative_fd && relative_id) + return libbpf_err(-EINVAL); + if (relative_id) { + attr.link_create.netkit.relative_id = relative_id; + attr.link_create.flags |= BPF_F_ID; + } else { + attr.link_create.netkit.relative_fd = relative_fd; + } + attr.link_create.netkit.expected_revision = OPTS_GET(opts, netkit.expected_revision, 0); + if (!OPTS_ZEROED(opts, netkit)) + return libbpf_err(-EINVAL); + break; default: if (!OPTS_ZEROED(opts, flags)) return libbpf_err(-EINVAL); diff --git a/tools/lib/bpf/bpf.h b/tools/lib/bpf/bpf.h index 74c2887cfd24..d0f53772bdc0 100644 --- a/tools/lib/bpf/bpf.h +++ b/tools/lib/bpf/bpf.h @@ -415,6 +415,11 @@ struct bpf_link_create_opts { __u32 relative_id; __u64 expected_revision; } tcx; + struct { + __u32 relative_fd; + __u32 relative_id; + __u64 expected_revision; + } netkit; }; size_t :0; }; diff --git a/tools/lib/bpf/libbpf.c b/tools/lib/bpf/libbpf.c index a295f6acf98f..e067be95da3c 100644 --- a/tools/lib/bpf/libbpf.c +++ b/tools/lib/bpf/libbpf.c @@ -126,6 +126,8 @@ static const char * const attach_type_name[] = { [BPF_TCX_INGRESS] = "tcx_ingress", [BPF_TCX_EGRESS] = "tcx_egress", [BPF_TRACE_UPROBE_MULTI] = "trace_uprobe_multi", + [BPF_NETKIT_PRIMARY] = "netkit_primary", + [BPF_NETKIT_PEER] = "netkit_peer", }; static const char * const link_type_name[] = { @@ -142,6 +144,7 @@ static const char * const link_type_name[] = { [BPF_LINK_TYPE_NETFILTER] = "netfilter", [BPF_LINK_TYPE_TCX] = "tcx", [BPF_LINK_TYPE_UPROBE_MULTI] = "uprobe_multi", + [BPF_LINK_TYPE_NETKIT] = "netkit", }; static const char * const map_type_name[] = { @@ -8915,6 +8918,8 @@ static const struct bpf_sec_def section_defs[] = { SEC_DEF("tc", SCHED_CLS, 0, SEC_NONE), /* deprecated / legacy, use tcx */ SEC_DEF("classifier", SCHED_CLS, 0, SEC_NONE), /* deprecated / legacy, use tcx */ SEC_DEF("action", SCHED_ACT, 0, SEC_NONE), /* deprecated / legacy, use tcx */ + SEC_DEF("netkit/primary", SCHED_CLS, BPF_NETKIT_PRIMARY, SEC_NONE), + SEC_DEF("netkit/peer", SCHED_CLS, BPF_NETKIT_PEER, SEC_NONE), SEC_DEF("tracepoint+", TRACEPOINT, 0, SEC_NONE, attach_tp), SEC_DEF("tp+", TRACEPOINT, 0, SEC_NONE, attach_tp), SEC_DEF("raw_tracepoint+", RAW_TRACEPOINT, 0, SEC_NONE, attach_raw_tp), @@ -12126,6 +12131,40 @@ bpf_program__attach_tcx(const struct bpf_program *prog, int ifindex, return bpf_program_attach_fd(prog, ifindex, "tcx", &link_create_opts); } +struct bpf_link * +bpf_program__attach_netkit(const struct bpf_program *prog, int ifindex, + const struct bpf_netkit_opts *opts) +{ + LIBBPF_OPTS(bpf_link_create_opts, link_create_opts); + __u32 relative_id; + int relative_fd; + + if (!OPTS_VALID(opts, bpf_netkit_opts)) + return libbpf_err_ptr(-EINVAL); + + relative_id = OPTS_GET(opts, relative_id, 0); + relative_fd = OPTS_GET(opts, relative_fd, 0); + + /* validate we don't have unexpected combinations of non-zero fields */ + if (!ifindex) { + pr_warn("prog '%s': target netdevice ifindex cannot be zero\n", + prog->name); + return libbpf_err_ptr(-EINVAL); + } + if (relative_fd && relative_id) { + pr_warn("prog '%s': relative_fd and relative_id cannot be set at the same time\n", + prog->name); + return libbpf_err_ptr(-EINVAL); + } + + link_create_opts.netkit.expected_revision = OPTS_GET(opts, expected_revision, 0); + link_create_opts.netkit.relative_fd = relative_fd; + link_create_opts.netkit.relative_id = relative_id; + link_create_opts.flags = OPTS_GET(opts, flags, 0); + + return bpf_program_attach_fd(prog, ifindex, "netkit", &link_create_opts); +} + struct bpf_link *bpf_program__attach_freplace(const struct bpf_program *prog, int target_fd, const char *attach_func_name) diff --git a/tools/lib/bpf/libbpf.h b/tools/lib/bpf/libbpf.h index 475378438545..6cd9c501624f 100644 --- a/tools/lib/bpf/libbpf.h +++ b/tools/lib/bpf/libbpf.h @@ -800,6 +800,21 @@ LIBBPF_API struct bpf_link * bpf_program__attach_tcx(const struct bpf_program *prog, int ifindex, const struct bpf_tcx_opts *opts); +struct bpf_netkit_opts { + /* size of this struct, for forward/backward compatibility */ + size_t sz; + __u32 flags; + __u32 relative_fd; + __u32 relative_id; + __u64 expected_revision; + size_t :0; +}; +#define bpf_netkit_opts__last_field expected_revision + +LIBBPF_API struct bpf_link * +bpf_program__attach_netkit(const struct bpf_program *prog, int ifindex, + const struct bpf_netkit_opts *opts); + struct bpf_map; LIBBPF_API struct bpf_link *bpf_map__attach_struct_ops(const struct bpf_map *map); diff --git a/tools/lib/bpf/libbpf.map b/tools/lib/bpf/libbpf.map index cc973b678a39..b52dc28dc8af 100644 --- a/tools/lib/bpf/libbpf.map +++ b/tools/lib/bpf/libbpf.map @@ -398,6 +398,7 @@ LIBBPF_1.3.0 { bpf_object__unpin; bpf_prog_detach_opts; bpf_program__attach_netfilter; + bpf_program__attach_netkit; bpf_program__attach_tcx; bpf_program__attach_uprobe_multi; ring__avail_data_size; -- 2.34.1