From patchwork Sun Oct 20 19:22:57 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?= X-Patchwork-Id: 837264 Received: from relay1-d.mail.gandi.net (relay1-d.mail.gandi.net [217.70.183.193]) (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 87D87193425; Sun, 20 Oct 2024 19:23:14 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=217.70.183.193 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1729452197; cv=none; b=LJHiJyyNnonRMP14Ygrw7EAWnHPF+94ADJe36sfYmPhwQf8y2wLNPB1UFrMRaLYQ5Sxot94ou8y2ZTKhXMJkMsodC+UsxNNZaZjRsSYFf/vEwbgbA6F+Y1zoTyeyefYc0FIEIKUusHzjxXsdVI21Z5TCbljjG+k5iAhzSo0LzQk= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1729452197; c=relaxed/simple; bh=Cs1yhRGBKUQkFzsjOTlsbtgZyFNPf+Flz359arN5DLo=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=O1stbMTQ9kn1RKEeagJF7sXZlayl7MGRcEU3ISpxSfxwa13ULZF72NV9euaT4b1wJTzcpPiH4EPKIrwmnzHiBbJ1Q0m7nhUGefh440W49mfgjCFSa8SnPS2O+ilJxEe/aIDJEI+Dzpq4g+z+BgQs2Hrw4yn34FpGcUrIrrX3+FU= 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=X8/heZeJ; arc=none smtp.client-ip=217.70.183.193 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="X8/heZeJ" Received: by mail.gandi.net (Postfix) with ESMTPSA id 56AB4240009; Sun, 20 Oct 2024 19:23:11 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bootlin.com; s=gm1; t=1729452192; 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=Wq+8dgER22ihdwu+MBouUCZkQ4Npy6jQwIBTp1hzB+c=; b=X8/heZeJ35yP8ABUVFuqaKr5Q+bKE7YcineHAWV2yMWWU+WELAEGCHZrZfo/HBCoOUNr9X EbcTgbsgRbjKqd/FqRxjotv61b8XPBPgiHliImS4UHdgFAvXzj9856QgBJm32nunOs3XCw a3THQyxRIMC+D+qww15ND3bzFqLFo2SZC/aDXhifYpUOZuf1mDBd71Rij9wYRQsev+ZpNK OmxSPszujpko4GVjcCFgJ+MK29rLp1cnikXWZVGJb/BKCXv1f9HKqkmOCobNi3y3SXRR6t RKccqG4dW3oaa6yxtzxrKJAFq3DHbK+HGrlcWzaPpralcKoTaZ1DUEUoAfq2fA== From: =?utf-8?q?Alexis_Lothor=C3=A9_=28eBPF_Foundation=29?= Date: Sun, 20 Oct 2024 21:22:57 +0200 Subject: [PATCH bpf-next v2 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: <20241020-syncookie-v2-5-2db240225fed@bootlin.com> References: <20241020-syncookie-v2-0-2db240225fed@bootlin.com> In-Reply-To: <20241020-syncookie-v2-0-2db240225fed@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 29b946d84816e41e87f11d2400f5c9a68f91a126..cf15cc3be49105db2a47d5c8686db7236ce9dd09 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) { @@ -71,6 +73,7 @@ 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) @@ -183,6 +186,10 @@ 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 b38ca3c35994ba8e36d5108fa5f2f4053384368a..1cd1a1b72cb5e8f515302d452ca17727d8e2f58a 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 */