@@ -1098,6 +1098,59 @@ test_ipv4_md5_vrf__global_server__bind_ifindex0()
set_sysctl net.ipv4.tcp_l3mdev_accept="$old_tcp_l3mdev_accept"
}
+ipv4_tcp_dontroute()
+{
+ local syncookies=$1
+ local nsa_syncookies
+ local nsb_syncookies
+ local a
+
+ #
+ # Link local connection tests (SO_DONTROUTE).
+ # Connections should succeed only when the remote IP address is
+ # on link (doesn't need to be routed through a gateway).
+ #
+
+ nsa_syncookies=$(ip netns exec "${NSA}" sysctl -n net.ipv4.tcp_syncookies)
+ nsb_syncookies=$(ip netns exec "${NSB}" sysctl -n net.ipv4.tcp_syncookies)
+ ip netns exec "${NSA}" sysctl -wq net.ipv4.tcp_syncookies=${syncookies}
+ ip netns exec "${NSB}" sysctl -wq net.ipv4.tcp_syncookies=${syncookies}
+
+ # Test with eth1 address (on link).
+
+ a=${NSB_IP}
+ log_start
+ do_run_cmd nettest -B -N "${NSA}" -O "${NSB}" -r ${a} --client-dontroute
+ log_test_addr ${a} $? 0 "SO_DONTROUTE client, syncookies=${syncookies}"
+
+ a=${NSB_IP}
+ log_start
+ do_run_cmd nettest -B -N "${NSA}" -O "${NSB}" -r ${a} --server-dontroute
+ log_test_addr ${a} $? 0 "SO_DONTROUTE server, syncookies=${syncookies}"
+
+ # Test with loopback address (routed).
+ #
+ # The client would use the eth1 address as source IP by default.
+ # Therefore, we need to use the -c option here, to force the use of the
+ # routed (loopback) address as source IP (so that the server will try
+ # to respond to a routed address and not a link local one).
+
+ a=${NSB_LO_IP}
+ log_start
+ show_hint "Should fail 'Network is unreachable' since server is not on link"
+ do_run_cmd nettest -B -N "${NSA}" -O "${NSB}" -c "${NSA_LO_IP}" -r ${a} --client-dontroute
+ log_test_addr ${a} $? 1 "SO_DONTROUTE client, syncookies=${syncookies}"
+
+ a=${NSB_LO_IP}
+ log_start
+ show_hint "Should timeout since server cannot respond (client is not on link)"
+ do_run_cmd nettest -B -N "${NSA}" -O "${NSB}" -c "${NSA_LO_IP}" -r ${a} --server-dontroute
+ log_test_addr ${a} $? 2 "SO_DONTROUTE server, syncookies=${syncookies}"
+
+ ip netns exec "${NSB}" sysctl -wq net.ipv4.tcp_syncookies=${nsb_syncookies}
+ ip netns exec "${NSA}" sysctl -wq net.ipv4.tcp_syncookies=${nsa_syncookies}
+}
+
ipv4_tcp_novrf()
{
local a
@@ -1217,6 +1270,9 @@ ipv4_tcp_novrf()
log_test_addr ${a} $? 1 "No server, device client, local conn"
ipv4_tcp_md5_novrf
+
+ ipv4_tcp_dontroute 0
+ ipv4_tcp_dontroute 2
}
ipv4_tcp_vrf()
Use nettest --{client,server}-dontroute to test the kernel behaviour with TCP sockets having the SO_DONTROUTE option. Sending packets to a neighbour (on link) host, should work. When the host is behind a router, sending should fail. Client and server sockets are tested independently, so that we can cover different TCP kernel paths. SO_DONTROUTE also affects the syncookies path. So ipv4_tcp_dontroute() is made to work with or without syncookies, to cover both paths. Signed-off-by: Guillaume Nault <gnault@redhat.com> --- v2: Use 'nettest -B' instead of invoking two nettest instances for client and server. tools/testing/selftests/net/fcnal-test.sh | 56 +++++++++++++++++++++++ 1 file changed, 56 insertions(+)