From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mta0.migadu.com (out-132.mta0.migadu.com [91.218.175.132]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 9814D3955CA for ; Wed, 23 Sep 2026 06:06:15 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=91.218.175.132 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1790143577; cv=none; b=FwPGwgi/ZSYszKxySKjXlpK3cdtvWZB2A5AXzxJ2IZrfSDJzBay+RLuZM394SBvrF4J9mfwZrdgrsZQwVQ9n72bHHWQ6AvBj/2StDHW7mLrekO2d1EyHbBj84LmIWBAS5BZbFvXTv+PR8mX2JAtxvqkSmkJR80RzFSbzzlfQtzY= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1790143577; c=relaxed/simple; bh=XdKXz+ux0PexVX3nnKa4V0T4ew+itOjV9Q3nU5kif94=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=nlAWeXHybcVAl0NF8AQayBbS/cbgpzS9A7BhVUlzltOGYwuhB3CwARa9AkkE9p2frJdI0nThZbBJIcduRhte2g2agdVPLuy0nu9MJ3asYZevaLY5jWof33CSdrtjcQz5p99Psjp1f5Yqfi6/D0xiJuhyXrn1AQbGrfP4rMXjc8Y= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.dev; spf=pass smtp.mailfrom=linux.dev; dkim=pass (1024-bit key) header.d=linux.dev header.i=@linux.dev header.b=dycMvKCC; arc=none smtp.client-ip=91.218.175.132 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.dev Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linux.dev Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux.dev header.i=@linux.dev header.b="dycMvKCC" X-Envelope-To: linux-kernel@vger.kernel.org DKIM-Signature: a=rsa-sha256; bh=XdKXz+ux0PexVX3nnKa4V0T4ew+itOjV9Q3nU5kif94=; c=simple/simple; d=linux.dev; h=from:to:subject:date:message-id:mime-version:content-type; s=key1; t=1790143573; v=1; x=1790748373; b=dycMvKCCXJyv8hwxr04HjHxlkZTx/NpI1ZhtGQlypXK0OZYFceet0JcPfmoEK9ycl54VhM1z iyK3FMWKN7vP3alsVtltaJbugT0/ncPEBX8qDKObrFr2bw+XShXGkZJ1pPFCf/h/61x9f1JeiRd QKXQKtp5AVO/WZSzNVkXxVfk= X-Envelope-To: linux-kernel@vger.kernel.org Received: by smtp.migadu.com with ESMTPS id 3b5c51dddf773d3e; Wed, 23 Sep 2026 06:06:13 +0000 X-Mizu-Trace-ID: 3b5c51dddf773d3e X-Migadu-Flow: FLOW_OUT From: Jiayuan Chen To: netdev@vger.kernel.org Cc: Jiayuan Chen , Willem de Bruijn , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Simon Horman , Shuah Khan , Tom Herbert , linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org Subject: [PATCH net 2/2] selftests/net: check auto-selected port with SO_REUSEPORT Date: Wed, 23 Sep 2026 14:05:45 +0800 Message-ID: <20260923060547.118748-2-jiayuan.chen@linux.dev> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20260923060547.118748-1-jiayuan.chen@linux.dev> References: <20260923060547.118748-1-jiayuan.chen@linux.dev> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Use IP_LOCAL_PORT_RANGE to limit a socket to 8 ports and bind 8 SO_REUSEPORT sockets to port 0. They must get 8 distinct ports and the 9th bind must fail with EADDRINUSE. TCP and UDP should both behave this way. # ./ip_local_port_range.sh Before the udp fix: ok 5 ip_local_port_range.ip4_tcp.exhaust_8_port_range_reuseport not ok 12 ip_local_port_range.ip4_udp.exhaust_8_port_range_reuseport ok 33 ip_local_port_range.ip6_tcp.exhaust_8_port_range_reuseport not ok 40 ip_local_port_range.ip6_udp.exhaust_8_port_range_reuseport After: ok 5 ip_local_port_range.ip4_tcp.exhaust_8_port_range_reuseport ok 12 ip_local_port_range.ip4_udp.exhaust_8_port_range_reuseport ok 33 ip_local_port_range.ip6_tcp.exhaust_8_port_range_reuseport ok 40 ip_local_port_range.ip6_udp.exhaust_8_port_range_reuseport Signed-off-by: Jiayuan Chen --- .../selftests/net/ip_local_port_range.c | 27 ++++++++++++++++++- 1 file changed, 26 insertions(+), 1 deletion(-) diff --git a/tools/testing/selftests/net/ip_local_port_range.c b/tools/testing/selftests/net/ip_local_port_range.c index e6834a6cfc8f..04feb702fff4 100644 --- a/tools/testing/selftests/net/ip_local_port_range.c +++ b/tools/testing/selftests/net/ip_local_port_range.c @@ -301,7 +301,9 @@ TEST_F(ip_local_port_range, single_port_range) } } -TEST_F(ip_local_port_range, exhaust_8_port_range) +static void exhaust_8_port_range(struct __test_metadata *_metadata, + const FIXTURE_VARIANT(ip_local_port_range) *variant, + bool reuseport) { __u8 port_set = 0; int i, fd, err; @@ -313,6 +315,11 @@ TEST_F(ip_local_port_range, exhaust_8_port_range) fd = socket(variant->so_domain, variant->so_type, variant->so_protocol); ASSERT_GE(fd, 0) TH_LOG("socket failed"); + if (reuseport) { + err = setsockopt(fd, SOL_SOCKET, SO_REUSEPORT, &(int){ 1 }, sizeof(int)); + ASSERT_TRUE(!err) TH_LOG("setsockopt(SO_REUSEPORT) failed"); + } + range = pack_port_range(40000, 40007); err = setsockopt(fd, SOL_IP, IP_LOCAL_PORT_RANGE, &range, sizeof(range)); ASSERT_TRUE(!err) TH_LOG("setsockopt(IP_LOCAL_PORT_RANGE) failed"); @@ -335,6 +342,11 @@ TEST_F(ip_local_port_range, exhaust_8_port_range) fd = socket(variant->so_domain, variant->so_type, variant->so_protocol); ASSERT_GE(fd, 0) TH_LOG("socket failed"); + if (reuseport) { + err = setsockopt(fd, SOL_SOCKET, SO_REUSEPORT, &(int){ 1 }, sizeof(int)); + ASSERT_TRUE(!err) TH_LOG("setsockopt(SO_REUSEPORT) failed"); + } + range = pack_port_range(40000, 40007); err = setsockopt(fd, SOL_IP, IP_LOCAL_PORT_RANGE, &range, sizeof(range)); ASSERT_TRUE(!err) TH_LOG("setsockopt(IP_LOCAL_PORT_RANGE) failed"); @@ -352,6 +364,19 @@ TEST_F(ip_local_port_range, exhaust_8_port_range) } } +TEST_F(ip_local_port_range, exhaust_8_port_range) +{ + exhaust_8_port_range(_metadata, variant, false); +} + +/* Auto-selected port must not land on a port already taken by a + * SO_REUSEPORT socket, so all 8 sockets must get distinct ports. + */ +TEST_F(ip_local_port_range, exhaust_8_port_range_reuseport) +{ + exhaust_8_port_range(_metadata, variant, true); +} + TEST_F(ip_local_port_range, late_bind) { union { -- 2.43.0