netdev - [PATCH net] selftests: Fix IPv6 address bind tests

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Message-Id: <20211211182616.74865-1-dsahern@kernel.org>
Date:   Sat, 11 Dec 2021 11:26:16 -0700
From:   David Ahern <dsahern@...nel.org>
To:     netdev@...r.kernel.org
Cc:     David Ahern <dsahern@...nel.org>,
        Li Zhijian <lizhijian@...itsu.com>
Subject: [PATCH net] selftests: Fix IPv6 address bind tests

IPv6 allows binding a socket to a device then binding to an address
not on the device (__inet6_bind -> ipv6_chk_addr with strict flag
not set). Update the bind tests to reflect legacy behavior.

Fixes: 34d0302ab861 ("selftests: Add ipv6 address bind tests to fcnal-test")
Reported-by: Li Zhijian <lizhijian@...itsu.com>
Signed-off-by: David Ahern <dsahern@...nel.org>
---
 tools/testing/selftests/net/fcnal-test.sh | 14 +++++++++++---
 1 file changed, 11 insertions(+), 3 deletions(-)

diff --git a/tools/testing/selftests/net/fcnal-test.sh b/tools/testing/selftests/net/fcnal-test.sh
index 25bba4557a8e..daa63e087b9f 100755
--- a/tools/testing/selftests/net/fcnal-test.sh
+++ b/tools/testing/selftests/net/fcnal-test.sh
@@ -3461,11 +3461,14 @@ ipv6_addr_bind_novrf()
 	run_cmd nettest -6 -s -l ${a} -I ${NSA_DEV} -t1 -b
 	log_test_addr ${a} $? 0 "TCP socket bind to local address after device bind"
 
+	# Sadly, the kernel allows binding a socket to a device and then
+	# binding to an address not on the device. So this test passes
+	# when it really should not
 	a=${NSA_LO_IP6}
 	log_start
-	show_hint "Should fail with 'Cannot assign requested address'"
+	show_hint "Tecnically should fail since address is not on device but kernel allows"
 	run_cmd nettest -6 -s -l ${a} -I ${NSA_DEV} -t1 -b
-	log_test_addr ${a} $? 1 "TCP socket bind to out of scope local address"
+	log_test_addr ${a} $? 0 "TCP socket bind to out of scope local address"
 }
 
 ipv6_addr_bind_vrf()
@@ -3514,10 +3517,15 @@ ipv6_addr_bind_vrf()
 	run_cmd nettest -6 -s -l ${a} -I ${NSA_DEV} -t1 -b
 	log_test_addr ${a} $? 0 "TCP socket bind to local address with device bind"
 
+	# Sadly, the kernel allows binding a socket to a device and then
+	# binding to an address not on the device. The only restriction
+	# is that the address is valid in the L3 domain. So this test
+	# passes when it really should not
 	a=${VRF_IP6}
 	log_start
+	show_hint "Tecnically should fail since address is not on device but kernel allows"
 	run_cmd nettest -6 -s -l ${a} -I ${NSA_DEV} -t1 -b
-	log_test_addr ${a} $? 1 "TCP socket bind to VRF address with device bind"
+	log_test_addr ${a} $? 0 "TCP socket bind to VRF address with device bind"
 
 	a=${NSA_LO_IP6}
 	log_start
-- 
2.25.1