From patchwork Wed Oct 16 18:35:26 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: =?utf-8?q?Alexis_Lothor=C3=A9_=28eBPF_Foundation=29?= X-Patchwork-Id: 13838715 Received: from relay6-d.mail.gandi.net (relay6-d.mail.gandi.net [217.70.183.198]) (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 998EC21644E; Wed, 16 Oct 2024 18:35:52 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=217.70.183.198 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1729103755; cv=none; b=N5z3SimAD4E4NK3ZR1vwFxtkeH6xSwdeE5w7MsaXL87GwZcUlkfZgZRAmmRVeN1UU03IYVV1Nojb9C65LLlZkhL0sIZxnRSr6DPOWbV2hedpCgEuDpxleAR8oq5rOgknMBwHYGqecgQC2cF8j59smd20SVSy4Sr3mxQMVyD1uE4= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1729103755; c=relaxed/simple; bh=QZsB5U3o4fWC6OvJATGaE6hO0WbpzVDOgdrYIHKoeHE=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=e6O3ci46b0J1uixQ4G/8DjS/T2VjS2zWskKPzirkZPmskThtvNPsUH0ouEA8+4Wxm76+qvyuRGu29Il+wyfkCwENfjbH6t59wmsOBBsGD8VWcoXdTd1Ym3+DBtJuDGgiADVciC1BoRf/ckMODwDrzqai1aN4aqrxGoz84CfGlc8= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=bootlin.com; spf=pass smtp.mailfrom=bootlin.com; dkim=pass (2048-bit key) header.d=bootlin.com header.i=@bootlin.com header.b=Ovk5ZWmH; arc=none smtp.client-ip=217.70.183.198 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=bootlin.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=bootlin.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=bootlin.com header.i=@bootlin.com header.b="Ovk5ZWmH" Received: by mail.gandi.net (Postfix) with ESMTPSA id DD3B5C0008; Wed, 16 Oct 2024 18:35:49 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bootlin.com; s=gm1; t=1729103751; 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=bWDp6iTH1KhErdDyqNshDxyp3s+xlqWV7mCPKhFp6VU=; b=Ovk5ZWmHq8CCWlaVX+1MIp5oXtDp7QHx7TbQp9HVGsbVLO862l//G2DSFmYksVJz0YV9oe D/nhyOBPUt/kyLZRc9ZcJ9hst8TBe+3jQ7in+8yKCUkKao9MLEtkI6wvSrYx96oBnxZHXO hck9rOI0n/YfRBo9/iqD/O8n13aYQnMGnjUuJWM5lQALbxq3kDNhx260HaHsxJx+Wlj0Y9 VxM5DmRDFF4hrouCijCxjm6MKI5psgD3KCM38h8xGq9MeIvTgZ/srvk+cXOlfUeqUhXWQq vvnFOxRv3gBbvQqN7ENP4Bb6Gq3Gzhvds3IGmlXUbppZlei3JfP/dVx6XF6kSQ== From: =?utf-8?q?Alexis_Lothor=C3=A9_=28eBPF_Foundation=29?= Date: Wed, 16 Oct 2024 20:35:26 +0200 Subject: [PATCH bpf-next 5/6] selftests/bpf: test MSS value returned with bpf_tcp_gen_syncookie Precedence: bulk X-Mailing-List: linux-kselftest@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-Id: <20241016-syncookie-v1-5-3b7a0de12153@bootlin.com> References: <20241016-syncookie-v1-0-3b7a0de12153@bootlin.com> In-Reply-To: <20241016-syncookie-v1-0-3b7a0de12153@bootlin.com> To: Alexei Starovoitov , Daniel Borkmann , Andrii Nakryiko , Martin KaFai Lau , Eduard Zingerman , Song Liu , Yonghong Song , John Fastabend , KP Singh , Stanislav Fomichev , Hao Luo , Jiri Olsa , Mykola Lysenko , Shuah Khan , "David S. Miller" , Jakub Kicinski , Jesper Dangaard Brouer Cc: ebpf@linuxfoundation.org, Thomas Petazzoni , Lorenz Bauer , bpf@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, =?utf-8?q?Alexis_Lothor=C3=A9_=28eBPF_Foundation?= =?utf-8?q?=29?= X-Mailer: b4 0.14.2 X-GND-Sasl: alexis.lothore@bootlin.com One remaining difference between test_tcp_check_syncookie.sh and btf_skc_cls_ingress is a small test on the mss value embedded in the cookie generated with the eBPF helper. Bring the corresponding test in btf_skc_cls_ingress. Signed-off-by: Alexis Lothoré (eBPF Foundation) --- tools/testing/selftests/bpf/prog_tests/btf_skc_cls_ingress.c | 7 +++++++ tools/testing/selftests/bpf/progs/test_btf_skc_cls_ingress.c | 2 ++ 2 files changed, 9 insertions(+) diff --git a/tools/testing/selftests/bpf/prog_tests/btf_skc_cls_ingress.c b/tools/testing/selftests/bpf/prog_tests/btf_skc_cls_ingress.c index e0f8fe818f4230a1d5bf0118133c5a9fb50345e1..64601bafdd23e7fb13ebd496ac914660685f1efc 100644 --- a/tools/testing/selftests/bpf/prog_tests/btf_skc_cls_ingress.c +++ b/tools/testing/selftests/bpf/prog_tests/btf_skc_cls_ingress.c @@ -27,6 +27,8 @@ #define SERVER_ADDR_IPV4 "127.0.0.1" #define SERVER_ADDR_IPV6 "::1" #define SERVER_ADDR_DUAL "::0" +/* RFC791, 576 for minimal IPv4 datagram, minus 40 bytes of TCP header */ +#define MIN_IPV4_MSS 536 static struct netns_obj *prepare_netns(struct test_btf_skc_cls_ingress *skel) { @@ -73,6 +75,7 @@ static void reset_test(struct test_btf_skc_cls_ingress *skel) skel->bss->recv_cookie = 0; skel->bss->gen_cookie = 0; skel->bss->linum = 0; + skel->bss->mss = 0; } static void print_err_line(struct test_btf_skc_cls_ingress *skel) @@ -184,6 +187,10 @@ static void run_test(struct test_btf_skc_cls_ingress *skel, bool gen_cookies, "syncookie properly generated"); ASSERT_EQ(skel->bss->gen_cookie, skel->bss->recv_cookie, "matching syncookies on client and server"); + ASSERT_GT(skel->bss->mss, MIN_IPV4_MSS, + "MSS in cookie min value"); + ASSERT_LT(skel->bss->mss, USHRT_MAX, + "MSS in cookie max value"); } done: diff --git a/tools/testing/selftests/bpf/progs/test_btf_skc_cls_ingress.c b/tools/testing/selftests/bpf/progs/test_btf_skc_cls_ingress.c index cd528f8792ff2eb14683cbc13e8b0f3fd38329e9..3810ce98d3d54276f9a0130a887f59c79a21288e 100644 --- a/tools/testing/selftests/bpf/progs/test_btf_skc_cls_ingress.c +++ b/tools/testing/selftests/bpf/progs/test_btf_skc_cls_ingress.c @@ -15,6 +15,7 @@ __u16 listen_tp_sport = 0; __u16 req_sk_sport = 0; __u32 recv_cookie = 0; __u32 gen_cookie = 0; +__u32 mss = 0; __u32 linum = 0; #define LOG() ({ if (!linum) linum = __LINE__; }) @@ -46,6 +47,7 @@ static void test_syncookie_helper(void *iphdr, int iphdr_size, LOG(); } else { gen_cookie = (__u32)mss_cookie; + mss = mss_cookie >> 32; } } else if (gen_cookie) { /* It was in cookie mode */