From patchwork Wed Sep 11 08:41:19 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Florian Kauer X-Patchwork-Id: 13799890 X-Patchwork-Delegate: bpf@iogearbox.net 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 736C81547CF; Wed, 11 Sep 2024 08:41:47 +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=1726044109; cv=none; b=hWw0JAHdCq2AosQxx2JKGUoFTrhcH4dYsjKsFyjgQGdl84DbpoaFaIaS5G7+hlxlHHjWg+D1Gv5ayk2tljB/0y52ju5AXY9i5v7eTSHU3zyGOqVAE/OMATsE4BXHJbIM7dLqHGcp/9ftDGNwAK4QZyfFQhmxrY0AjMfjI8+Rm08= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1726044109; c=relaxed/simple; bh=Tx4/pT8qFSodepQPWKDasNYG6F57zRV9CLJDkS7Vo6s=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=K54PncNiJHK7Pg06ZgS3hnlABTtEAagw2c/iZRQ0Sxgx1MeijC4p4BNoJ7XYiQPpGms9bsyFmEdPNSglVFgAYP8c/17Ez7/Elzlinl3Gxv8EXjqDxm6DqbEo2YXJbe0WjgjEg9nAazF1fevoyUvHi5KwZN4LxIspcGU+eLBvA0k= 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=0y/KHYd6; dkim=permerror (0-bit key) header.d=linutronix.de header.i=@linutronix.de header.b=znAiGBFr; 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="0y/KHYd6"; dkim=permerror (0-bit key) header.d=linutronix.de header.i=@linutronix.de header.b="znAiGBFr" From: Florian Kauer DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020; t=1726044105; 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=XVxu958V8507cUbid7tMca8UQrmhre2RgIlcswCFXZM=; b=0y/KHYd6eL31QtaCLofVoBHCCNTZjp4GGUt2xkddH8E94D4/HNJH8f87O4v2B1lZngGo6w u0gdl9tjaCRTXRsXYRnIsnBJVsmEvkaf0U/0CIakKS33UI7udBnI9wBKUK/9TBeynqrfrb UGi6koDxFC+Hlj+ADqBNMmVRSTyIZuwlZup5GzAisJIW7vc43Zb99uCw5bKTkSofPb1wH2 tgGHD6JxlNADDqEjsu4pZHWLF+tJSKkEzLAi7cgaRr2rJJ7302eJTzcHHaR8qpcvIp3j9V k48nphriOLtklBKMyevpkpaRNcLEWZvv5Ta0UbNuBVcl2aT39JyMggRiQ8UHbA== DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020e; t=1726044105; 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=XVxu958V8507cUbid7tMca8UQrmhre2RgIlcswCFXZM=; b=znAiGBFrvXDxMThShtSpJRsee4RLO0O1d01pXPWZfw6t9uca41sdQrnDIHtaAIOb+08jve XZx7yUGDHW4e78CA== Date: Wed, 11 Sep 2024 10:41:19 +0200 Subject: [PATCH net v4 2/2] bpf: selftests: send packet to devmap redirect XDP Precedence: bulk X-Mailing-List: bpf@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-Id: <20240911-devel-koalo-fix-ingress-ifindex-v4-2-5c643ae10258@linutronix.de> References: <20240911-devel-koalo-fix-ingress-ifindex-v4-0-5c643ae10258@linutronix.de> In-Reply-To: <20240911-devel-koalo-fix-ingress-ifindex-v4-0-5c643ae10258@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=6428; i=florian.kauer@linutronix.de; h=from:subject:message-id; bh=Tx4/pT8qFSodepQPWKDasNYG6F57zRV9CLJDkS7Vo6s=; b=owEBbQKS/ZANAwAKATKF5IolV+EkAcsmYgBm4VfDjrVIdwzowFeCGWyOJilwgiz3LaBHH9Oe4 km9RQ3PhV2JAjMEAAEKAB0WIQSG5cmCLvpm5t9g7UUyheSKJVfhJAUCZuFXwwAKCRAyheSKJVfh JPdrEADTv/J5QaUU+9btNzGizLZ03zAO5etez+MpKfSj0sXsDLYWQHkjB9ERjVOi0gEYWUrf/dw ohISsRRknlyCucP/VVf8yK5VmibGeeiu53b2H406nvPZ8dT8LoqW3rH5AcFFNCM7V5Ed0cEl+jc Di0/pwdhUBp9OYfLi4vs1v0ssPBUYIJ9CnZihd52Jo/89fl1ZPFLHljzU2Kq3W9eGE9fjniHq/9 5S3IgCNBn2jMk1sbx3McLEYX4f+AigCT3XNhHsdd3mVOrP6TTbV21eOihnC37mthaPFTCwIPsO9 VrFQ9hHQhNFma400UhGSeJwKUs8QaTS5jiDxRMLw27fTnvaCqDkCOs2R6IBXZKeaoL8UuLXOcZr H8UYoF083e9uv2/n1aUFtqEULV0BXTvP3lDVW6gIyKJMHOzORK+pDtmO3pKmuobXrCQnSvzt6uQ UP9mqq8Mv06BrmW2fnvln0rlxVytx5SsIfdP7sGaOy1uguYcPtbUUY+3ZmSZaYAKNhO1Xx7sHCB WE2nCPAhUO9lymz4wlrtOG2Zp7PW+duXtOEJ+v45UjOODIFWc9JQt3g249ClIR41pv5pHzwsYAi ajpZ9DOQMyaaSDL4cdai0vCB4xKuh/LqVlFdD1B/dROHcFbNtAl5/8tAqsX3wqptAlzDW0E6MpG JAnhqZP2vbkX6kg== X-Developer-Key: i=florian.kauer@linutronix.de; a=openpgp; fpr=F17D8B54133C2229493E64A0B5976DD65251944E X-Patchwork-Delegate: kuba@kernel.org 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 Reviewed-by: Toke Høiland-Jørgensen --- .../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..b4f6718cf7eb 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 = NULL; + 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")) + goto out_close; + + 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(); }