netdev - [PATCH net-next 2/2] selftests: Lowest IPv4 address in a subnet is valid

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Date:   Fri, 19 Mar 2021 17:03:18 -0700
From:   Seth David Schoen <schoen@...alty.org>
To:     netdev@...r.kernel.org
Cc:     davem@...emloft.net, kuba@...nel.org, gnu@...d.com,
        dave.taht@...il.com
Subject: [PATCH net-next 2/2] selftests: Lowest IPv4 address in a subnet is
 valid

Expect the lowest IPv4 address in a subnet to be assignable
and addressable as a unicast (non-broadcast) address on a
local network segment.

Signed-off-by: Seth David Schoen <schoen@...alty.org>
Acked-by: Dave Taht <dave.taht@...il.com>
---
 .../testing/selftests/net/unicast_extensions.sh | 17 +++++++++--------
 1 file changed, 9 insertions(+), 8 deletions(-)

diff --git a/tools/testing/selftests/net/unicast_extensions.sh b/tools/testing/selftests/net/unicast_extensions.sh
index dbf0421986df..66354cdd5ce4 100755
--- a/tools/testing/selftests/net/unicast_extensions.sh
+++ b/tools/testing/selftests/net/unicast_extensions.sh
@@ -189,6 +189,15 @@ segmenttest 255.255.255.1 255.255.255.254 24 "assign and ping inside 255.255.255
 route_test 240.5.6.7 240.5.6.1  255.1.2.1    255.1.2.3      24 "route between 240.5.6/24 and 255.1.2/24 (is allowed)"
 route_test 0.200.6.7 0.200.38.1 245.99.101.1 245.99.200.111 16 "route between 0.200/16 and 245.99/16 (is allowed)"
 #
+# Test support for lowest address ending in .0
+segmenttest 5.10.15.20 5.10.15.0 24 "assign and ping lowest address (/24)"
+#
+# Test support for lowest address not ending in .0
+segmenttest 192.168.101.192 192.168.101.193 26 "assign and ping lowest address (/26)"
+#
+# Routing using lowest address as a gateway/endpoint
+route_test 192.168.42.1 192.168.42.0 9.8.7.6 9.8.7.0 24 "routing using lowest address"
+#
 # ==============================================
 # ==== TESTS THAT CURRENTLY EXPECT FAILURE =====
 # ==============================================
@@ -202,14 +211,6 @@ segmenttest 255.255.255.1 255.255.255.255 16 "assigning 255.255.255.255 (is forb
 # Currently Linux does not allow this, so this should fail too
 segmenttest 127.99.4.5 127.99.4.6 16 "assign and ping inside 127/8 (is forbidden)"
 #
-# Test support for lowest address
-# Currently Linux does not allow this, so this should fail too
-segmenttest 5.10.15.20 5.10.15.0 24 "assign and ping lowest address (is forbidden)"
-#
-# Routing using lowest address as a gateway/endpoint
-# Currently Linux does not allow this, so this should fail too
-route_test 192.168.42.1 192.168.42.0 9.8.7.6 9.8.7.0 24 "routing using lowest address (is forbidden)"
-#
 # Test support for unicast use of class D
 # Currently Linux does not allow this, so this should fail too
 segmenttest 225.1.2.3 225.1.2.200 24 "assign and ping class D address (is forbidden)"
-- 
2.25.1