From patchwork Fri Sep 6 14:16:26 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Florian Kauer X-Patchwork-Id: 13794255 Received: from galois.linutronix.de (Galois.linutronix.de [193.142.43.55]) (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 41B7D1EEF9; Fri, 6 Sep 2024 14:16:44 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=193.142.43.55 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1725632207; cv=none; b=ZYBymUilvzhk0wnC/asr5LWP6Tqtkv/GhRAppiSLp6IWueJsJhwd54gl2PBfXbnYDRAwcsRhjev7BIlfVTa+hk4dbXvSAGkgJaTX4zdzOGDlz8F8qyGogKLZgLv5AkdMEklPIPu9hWasMijYEMC84RW6UT0FG3rtGhaspyObflw= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1725632207; c=relaxed/simple; bh=5DPoF+h1EijAJWiofVUgPO7pld2cGAEtC+ql8P6zBx0=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=DwhUfaU3T1J+oevq9D5iHm4+lTL+0j/0eeZNmZ728nVWjdJToftq5qMdWOm/RKRvFimIbM+6MvU4j0Jqm13XAWnTR0NN64X8UJXbzFT6XkahITsA2rE4AhMYKpgTx1mhobLzStNAf+pXjFdCM6ZI+4k24fjP4aMYN07ln0cF/i0= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linutronix.de; spf=pass smtp.mailfrom=linutronix.de; dkim=pass (2048-bit key) header.d=linutronix.de header.i=@linutronix.de header.b=De5c23xW; dkim=permerror (0-bit key) header.d=linutronix.de header.i=@linutronix.de header.b=cDefjgfk; arc=none smtp.client-ip=193.142.43.55 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linutronix.de Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linutronix.de Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=linutronix.de header.i=@linutronix.de header.b="De5c23xW"; dkim=permerror (0-bit key) header.d=linutronix.de header.i=@linutronix.de header.b="cDefjgfk" From: Florian Kauer DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020; t=1725632203; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=F1z+D6rnTHlvixKu5XBWRY4qyLlh6HJytqd5jXsU3JM=; b=De5c23xWRzCTr9Dn9RLVUV/L8G2F4jWkSQ8pVvDnIJXYouFqKRDAh1l8toNabEjqyeQ5YY SiU0/Ikz7ECUr+E78qltK21CW4yh0aItVwijYDHpsfzSpXGn71MEIbNxcNaH4wfilEPF/Y Sb+tH7MNw30JNLxty/Mbd7KwLnmEtxJpfCKZ40hvC/qbEZCfcbCSOu+NYnAdgk/NYv1XAH 6p+zZYZFPsyLG2sbW+/Y7QLeMnrrESpOfk3KKV96vWPloRY0Eyg9r0CbOTpVVTKaRimUPH WsSzi98g2juXQ706gjkRnujB/TArZuepwLgtUlfEpNVO34S1GNwbbr2ZOA7nmg== DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020e; t=1725632203; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=F1z+D6rnTHlvixKu5XBWRY4qyLlh6HJytqd5jXsU3JM=; b=cDefjgfkis0YCljz1gwj7x9pWPErwqsrRTtCqN63yGLP2mfmzwGXLHcQs4C7fADRp6C9Cm 7kLlYZRZTg37rGCA== Date: Fri, 06 Sep 2024 16:16:26 +0200 Subject: [PATCH net v2 2/2] bpf: selftests: send packet to devmap redirect XDP Precedence: bulk X-Mailing-List: linux-kselftest@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-Id: <20240906-devel-koalo-fix-ingress-ifindex-v2-2-4caa12c644b4@linutronix.de> References: <20240906-devel-koalo-fix-ingress-ifindex-v2-0-4caa12c644b4@linutronix.de> In-Reply-To: <20240906-devel-koalo-fix-ingress-ifindex-v2-0-4caa12c644b4@linutronix.de> To: Alexei Starovoitov , Daniel Borkmann , "David S. Miller" , Jakub Kicinski , Jesper Dangaard Brouer , John Fastabend , Andrii Nakryiko , Martin KaFai Lau , Eduard Zingerman , Song Liu , Yonghong Song , KP Singh , Stanislav Fomichev , Hao Luo , Jiri Olsa , =?utf-8?q?Toke_H=C3=B8iland-J=C3=B8rgensen?= , David Ahern , Hangbin Liu , Mykola Lysenko , Shuah Khan Cc: netdev@vger.kernel.org, bpf@vger.kernel.org, linux-kernel@vger.kernel.org, Jesper Dangaard Brouer , linux-kselftest@vger.kernel.org, Florian Kauer X-Developer-Signature: v=1; a=openpgp-sha256; l=6413; i=florian.kauer@linutronix.de; h=from:subject:message-id; bh=5DPoF+h1EijAJWiofVUgPO7pld2cGAEtC+ql8P6zBx0=; b=owEBbQKS/ZANAwAKATKF5IolV+EkAcsmYgBm2w7GwtWu7yC2TKTi5Y09ZIrOptkC3OgftiJCS zH5CekIrE2JAjMEAAEKAB0WIQSG5cmCLvpm5t9g7UUyheSKJVfhJAUCZtsOxgAKCRAyheSKJVfh JFo8D/9nPIN101HZhRoUJRyaBRqc1Fg5WD2Dk26WuBVHcdS+Uhbi9ouuZdIc+mPvKcjSseKwz86 CKXYK68MG8nLUjlMwSu/gSvMQkVKugBXOTAPJbFfIAzEgAWaEuPP/z6TBdNUN3O8KMJIkMC3czB ATFDWkWldsdl4+ek8kFY36yeEjQUXj3tHUGsMY8uMuadIFXZUdOBpX4IcCFUwi/XDW/FcdL6KKd 8S4NsJatzCVuRIR4ve6wSLdLnOMyslF6qYDAO4VxU18F5OOQbKM6lYgxFUv2TYeN8wrU5CUO4fL yG3NCgib87fXjY3heMNdBLRSz5lhG6j2zSMPMlI/41sltOmajYUQMPbrIRa+kZp5Zk2fAKlyT2r uX6eP/kBwhlDz+P7AEb5qIQTGAjwtm6w7FpaPxgFD/8I0kt9FbZ3Z+cLquKC+mUl6yQex48LIcr SlqFW86iybCnXMHyworkUN9xmsWF1fCwH0BQ/ns8LMRdz17rsy0zjCyFD/mfgfnADEvB65Y8txa dILUXE2zwVTQY5ULTuvYdFY83Xl8/p3otZk2CGTesurY7y6+oRiBco5OqN2wdTf2uXf7k9yhRnN vC6uKmQ+xLT2RHn0d0+Ng7lHJP3QiNhhPB2LGTBVqi1wRj2tNEoy+1+3s8kYNs/oKkoBORAAIIk DNSANF/ecc2BgcQ== X-Developer-Key: i=florian.kauer@linutronix.de; a=openpgp; fpr=F17D8B54133C2229493E64A0B5976DD65251944E The current xdp_devmap_attach test attaches a program that redirects to another program via devmap. It is, however, never executed, so do that to catch any bugs that might occur during execution. Also, execute the same for a veth pair so that we also cover the non-generic path. Warning: Running this without the bugfix in this series will likely crash your system. Signed-off-by: Florian Kauer --- .../selftests/bpf/prog_tests/xdp_devmap_attach.c | 114 +++++++++++++++++++-- 1 file changed, 108 insertions(+), 6 deletions(-) diff --git a/tools/testing/selftests/bpf/prog_tests/xdp_devmap_attach.c b/tools/testing/selftests/bpf/prog_tests/xdp_devmap_attach.c index ce6812558287..c9034f8ae63b 100644 --- a/tools/testing/selftests/bpf/prog_tests/xdp_devmap_attach.c +++ b/tools/testing/selftests/bpf/prog_tests/xdp_devmap_attach.c @@ -1,6 +1,9 @@ // SPDX-License-Identifier: GPL-2.0 +#include #include #include +#include +#include #include #include "test_xdp_devmap_helpers.skel.h" @@ -17,7 +20,7 @@ static void test_xdp_with_devmap_helpers(void) .ifindex = IFINDEX_LO, }; __u32 len = sizeof(info); - int err, dm_fd, map_fd; + int err, dm_fd, dm_fd_redir, map_fd; __u32 idx = 0; @@ -25,14 +28,11 @@ static void test_xdp_with_devmap_helpers(void) if (!ASSERT_OK_PTR(skel, "test_xdp_with_devmap_helpers__open_and_load")) return; - dm_fd = bpf_program__fd(skel->progs.xdp_redir_prog); - err = bpf_xdp_attach(IFINDEX_LO, dm_fd, XDP_FLAGS_SKB_MODE, NULL); + dm_fd_redir = bpf_program__fd(skel->progs.xdp_redir_prog); + err = bpf_xdp_attach(IFINDEX_LO, dm_fd_redir, XDP_FLAGS_SKB_MODE, NULL); if (!ASSERT_OK(err, "Generic attach of program with 8-byte devmap")) goto out_close; - err = bpf_xdp_detach(IFINDEX_LO, XDP_FLAGS_SKB_MODE, NULL); - ASSERT_OK(err, "XDP program detach"); - dm_fd = bpf_program__fd(skel->progs.xdp_dummy_dm); map_fd = bpf_map__fd(skel->maps.dm_ports); err = bpf_prog_get_info_by_fd(dm_fd, &info, &len); @@ -47,6 +47,23 @@ static void test_xdp_with_devmap_helpers(void) ASSERT_OK(err, "Read devmap entry"); ASSERT_EQ(info.id, val.bpf_prog.id, "Match program id to devmap entry prog_id"); + /* send a packet to trigger any potential bugs in there */ + char data[10] = {}; + DECLARE_LIBBPF_OPTS(bpf_test_run_opts, opts, + .data_in = &data, + .data_size_in = 10, + .flags = BPF_F_TEST_XDP_LIVE_FRAMES, + .repeat = 1, + ); + err = bpf_prog_test_run_opts(dm_fd_redir, &opts); + ASSERT_OK(err, "XDP test run"); + + /* wait for the packets to be flushed */ + kern_sync_rcu(); + + err = bpf_xdp_detach(IFINDEX_LO, XDP_FLAGS_SKB_MODE, NULL); + ASSERT_OK(err, "XDP program detach"); + /* can not attach BPF_XDP_DEVMAP program to a device */ err = bpf_xdp_attach(IFINDEX_LO, dm_fd, XDP_FLAGS_SKB_MODE, NULL); if (!ASSERT_NEQ(err, 0, "Attach of BPF_XDP_DEVMAP program")) @@ -124,6 +141,88 @@ static void test_xdp_with_devmap_frags_helpers(void) test_xdp_with_devmap_frags_helpers__destroy(skel); } +static void test_xdp_with_devmap_helpers_veth(void) +{ + struct test_xdp_with_devmap_helpers *skel; + struct bpf_prog_info info = {}; + struct bpf_devmap_val val = {}; + struct nstoken *nstoken = NULL; + __u32 len = sizeof(info); + int err, dm_fd, dm_fd_redir, map_fd, ifindex_dst; + __u32 idx = 0; + + SYS(out_close, "ip netns add testns"); + nstoken = open_netns("testns"); + if (!ASSERT_OK_PTR(nstoken, "setns")) + goto out_close; + + SYS(out_close, "ip link add veth_src type veth peer name veth_dst"); + SYS(out_close, "ip link set dev veth_src up"); + SYS(out_close, "ip link set dev veth_dst up"); + + val.ifindex = if_nametoindex("veth_src"); + ifindex_dst = if_nametoindex("veth_dst"); + if (!ASSERT_NEQ(val.ifindex, 0, "val.ifindex") || + !ASSERT_NEQ(ifindex_dst, 0, "ifindex_dst")) + goto out_close; + + skel = test_xdp_with_devmap_helpers__open_and_load(); + if (!ASSERT_OK_PTR(skel, "test_xdp_with_devmap_helpers__open_and_load")) + return; + + dm_fd_redir = bpf_program__fd(skel->progs.xdp_redir_prog); + err = bpf_xdp_attach(val.ifindex, dm_fd_redir, XDP_FLAGS_DRV_MODE, NULL); + if (!ASSERT_OK(err, "Attach of program with 8-byte devmap")) + goto out_close; + + dm_fd = bpf_program__fd(skel->progs.xdp_dummy_dm); + map_fd = bpf_map__fd(skel->maps.dm_ports); + err = bpf_prog_get_info_by_fd(dm_fd, &info, &len); + if (!ASSERT_OK(err, "bpf_prog_get_info_by_fd")) + goto out_close; + + val.bpf_prog.fd = dm_fd; + err = bpf_map_update_elem(map_fd, &idx, &val, 0); + ASSERT_OK(err, "Add program to devmap entry"); + + err = bpf_map_lookup_elem(map_fd, &idx, &val); + ASSERT_OK(err, "Read devmap entry"); + ASSERT_EQ(info.id, val.bpf_prog.id, "Match program id to devmap entry prog_id"); + + /* attach dummy to other side to enable reception */ + dm_fd = bpf_program__fd(skel->progs.xdp_dummy_prog); + err = bpf_xdp_attach(ifindex_dst, dm_fd, XDP_FLAGS_DRV_MODE, NULL); + if (!ASSERT_OK(err, "Attach of dummy XDP")) + goto out_close; + + /* send a packet to trigger any potential bugs in there */ + char data[10] = {}; + DECLARE_LIBBPF_OPTS(bpf_test_run_opts, opts, + .data_in = &data, + .data_size_in = 10, + .flags = BPF_F_TEST_XDP_LIVE_FRAMES, + .repeat = 1, + ); + err = bpf_prog_test_run_opts(dm_fd_redir, &opts); + ASSERT_OK(err, "XDP test run"); + + /* wait for the packets to be flushed */ + kern_sync_rcu(); + + err = bpf_xdp_detach(val.ifindex, XDP_FLAGS_DRV_MODE, NULL); + ASSERT_OK(err, "XDP program detach"); + + err = bpf_xdp_detach(ifindex_dst, XDP_FLAGS_DRV_MODE, NULL); + ASSERT_OK(err, "XDP program detach"); + +out_close: + if (nstoken) + close_netns(nstoken); + SYS_NOFAIL("ip netns del testns"); + + test_xdp_with_devmap_helpers__destroy(skel); +} + void serial_test_xdp_devmap_attach(void) { if (test__start_subtest("DEVMAP with programs in entries")) @@ -134,4 +233,7 @@ void serial_test_xdp_devmap_attach(void) if (test__start_subtest("Verifier check of DEVMAP programs")) test_neg_xdp_devmap_helpers(); + + if (test__start_subtest("DEVMAP with programs in entries on veth")) + test_xdp_with_devmap_helpers_veth(); }